<human>: There's a coworker of mine who has been bothering me for a while(about 3 months) now. She has a younger cousin that I also work with and we get along well, no problems there. But this coworker in particular, is socially challenged (not sure with what, exactly) and since we first met she seems to have taken interest in me and persistently (and awkwardly) tries to talk to me during work every chance she gets. I try to be polite as I usually am at work, but it seems like she might be mistaking my politeness for...something else, and won't stop approaching me while I'm trying to do my job. 

Most recently she asked me if I was in a relationship with anybody, to which I immediately cut her off stating that I don't talk about such things at work. She very awkwardly apologized for asking and I shrugged her off. It makes me extremely uncomfortable when people act so persistent like this around me, but she doesn't seem to take any hints that I'm not interested in socializing with her. Even if I have headphones in while I'm working, she still constantly tries to talk to me. I have a bad feeling that she will only continue to pester me in the longrun, when I simply want to do my work. But I'm afraid to speak up or do anything because I don't want to seem like a dick, since I have a good working relationship with her cousin and would like to maintain that. How can I get this woman to stop trying to talk to me all the time?

Can you condense the text into a few key points?
<bot>: socially challenged coworker won't leave me alone, how do I lowkey get her to leave me be without causing an open fuss about it?