Jeez, I am so sorry that you are having these issues with your friend. To me, this sounds like what someone with Borderline Personality Disorder would do. Being rejected is hard, and it sounds like she is using emotional blackmail to force you into a romantic love scenario. To be honest though, the timing of her bringing uo a relationship seems to imply that she really just wanted to use you as a way of getting out of her own financial troubles. You were smart not to take that bait.

It is hard and maybe you should tell someone in her family about what she said to you. My gut instinct is to not take it seriously as it just sounds to me like emotional blackmail, but I think her family would know her much better and would have a little more sway in convincing her to go to therapy or something. It's really tough because I honestly don't know what you should do in this case. I think the only thing that you could do is tell her family and hope for the best. I thin encouraging her to see a therapist is probably as much as you can do outside of that.