I just act nice to her. I mean, her stories of what she has survived that she tells you are fucked up. If you kind to her at all costs, she ends up getting better. Give her a normal meal. If she asks for something, say yes. Treat her like a friend and not property and it works out. I feel her death from her sickness is her giving up hope anyone is worth a shit. Pretty much suicide by the misfortune of being sick.
Also, R---ing her is honestly one of those options that exists but also makes you feel like shit in time. I hate that its an option.