I know that situation all too well V_V Ultimately, you cannot force anyone to stay alive. Whether they live or not is not up to you. There is a reasonable level of support one can expect from a friendship depending on how close the connection is. You do no one a favour by pushing yourself beyond that - you probably won't help your friend anyway, and you'll exhaust yourself.She'd sometimes tell me things like she'd end her life soon and had done something to herself (again)...and I honestly don't know what else to do. She's taking meds (which her other friend finances) but she said she doesn't have money to go to therapy sessions. I would try to listen to her and tell her to stay but each time she would just insist that nobody loves her, that no one would care if she died.
As painful as it is, you need to draw a clear boundary and say "I'm with you up to this point, beyond this I can't help you". It can be done gently but it has to be done firmly, repeatedly if need be.
It sounds like your friend lives in the Philippines, in which case there probably aren't a lot of helplines etc. available. In most 1st world countries, you can usually point someone in the direction of various NGOs who would be able to help, no idea if there is anything of that sort there.
The only way this kind of relationships ever work out, if they do, is with clear boundaries. They never, ever work out if one party keeps sinking in quicksand and the other keeps pulling, with no regard to their own health. That said, it's a very painful seat to be in, and you have to toughen up and not be as kind as you'd like to be.