Not looking for romance

I am a simple person, well after all, I am a man, at least last time I looked, and I like life uncomplicated.
While in Peru in 2014 I was leaving my apartment one day when I came across a lady standing in the street looking up at the building - she asked me about the apartments as she was looking for somewhere to move to (though she was put off by the rent I quoted I was paying!). When she heard my accent she asked where I was from, and then told me she had an English friend, who, like me, spent 6 months a year in Huanchaco, and we should meet up. Yay, I love matchmakers! We are both English, both single, and therefore must want to hook up. I made some excuses about being busy at the moment and went on my way, thinking that would be the end of it.
Two weeks later there is a knock on my door - she (the Peruvian lady, not her English friend) had tried every apartment looking for me, which wasn't that hard as there were only 4 of them. I invited her in out of courtesy, and she told me her friend was about to return to the UK, but also told me a potted version of her own life history - single mum (I guessed mid-forties), ex-husband in Argentina, where she lived with him for many years, doesn't know anyone here so is lonely (though has family in Trujillo, 10 kms, away as that is where she was originally from), no social life, and so on. I could barely get a word in edgewise, and she spoke very fast, but my understanding of Spanish was up to the task.
She again invited me round to meet her friend, for coffee or a meal, and again I made my excuses - I was just about to embark on my first motorbike trip - but she gave me her business card (she worked in a beauty salon) with phone number and email address, and asked me to get in touch when I got back.
As soon as she left I sent an email trying to explain that I was not looking for a relationship with anyone, hoped I had not misunderstood her intentions, and wishing her well. I hoped that might be the end of it! But a week later she again arrives at my apartment - she is unable to access her emails. so never got my message! Her friend has now left and she is very lonely, and only has her 10 year-old son for company, and never gets a chance to go out. I ask her about her family in Trujillo, and she says she doesn't really get on with them, as they disapproved of her marriage to an Argentinian and move there, so they won't help her, and also she lost touch with all her old friends while out of the country for so long.
I am feeling very uneasy about all this, especially as she keeps saying how important my friendship is - but my command of Spanish is not up explaining this effectively, and I get the impression she is not really listening to what I am saying anyway, and I trying so hard to say that I am not interested. After she goes I even try sending text messages, but next time I see her she says she cannot access text messages on her phone!
She even brings her son round to meet me one afternoon, on the way back from school! Then one evening she comes round in a really bad state, all weepy and saying how things are really tough for her, and has no-one to talk to, and values my friendship and really thinks highly of me - and I have no idea how to respond to this as I do not want to encourage her, but have no idea how to gently explain my feelings, and hoping I am not putting out the wrong signals, as everything I am doing seem to be encouraging her. A couple of days later she comes round in the morning, and after a good deal of beating around the bush asks if she can borrow 50 Soles (around £12), as work is slow and she needs to buy some food for her son. Yeah, I know, alarm bells are now going off, but I agree, hoping that this will change the relationship dynamics.
I start ignoring the door, too, as I can see who is there without being seen, both day and night - cruel, I suppose, but I cannot think of a better way of getting the message across. Things do go quiet for a while - I am doing some more trips on my bike, and don't see her at my door. Then I am on the way, on foot, to the market one morning when I bump into her with another man, who she introduces as her ex visiting from Argentina. She pays me back the 50 Soles, which I never expected to see again, and invites me for coffee with them both as her ex-husband is only visiting to see his son for a few days. Iam genuinely on a tight schedule so make my excuses. Then 2 days later I bump into him on his own, and he again invites me for coffee - I try to explain that I don't think it is a good idea, but I have trouble explaining things like this in English, let alone in a foreign language!
That wasn't long before my time in Peru in 2014 ended, and I didn't see either of them again before I left. 2015 I stayed in a different apartment block and saw no sign of her, so thought she must have finally got the message, and possibly moved away as well because Huanchaco is a very small town. That is until two weeks before I was leaving to return to Brazil. I often walk along the seafront promenade in Huanchaco, as I love the sea and definitely need the exercise, though I do tend to avoid the busiest times (festivals, weekends, and so on). This particular day was a Saturday and I had walked along about half the length of the promenade, which was fairly busy, but as is my wont I wasn't paying much attention to other people around me (too busy trying to avoid potholes in the pavement, and not bump into people), and instead of turning round and returning the same way, through the crowds, I cut through one block and returned along a street parallel to the seafront. Suddenly I heard my name being called, and turned to see her with her son and sister hurrying along behind me. I had walked past them buying something from a street vendor, and she recognised me.
Big hugs and introductions - it sounded as though her sister knew all about me - and the inevitable invitation to go and have coffee then and there, or for a meal tomorrow at her family home in Trujillo! I was genuinely on my way to a meeting (I do some irregular work with a small charity in Huanchaco), but she gave me her new phone number and extracted a promise that I would call to arrange something! Good Lord! I thought it was guys that had trouble taking a hint! It has been 12 months, and she is acting as though we are best friends and only parted yesterday.
Simple? I have never had a more complicated relationship - or non-relationship as I have been doing everything I can think of not to get involved. As I only have a fortnight left, and she now does live in Trujillo, 10 kms away, and doesn't know where I am staying this year, I am hoping that this will be the end of it - at least until 2016 when I return to Peru again - but I definitely get the feeling I am being stalked!