This roommate is not behaving ok. That's not you're fault. You do not owe saving her from anything. The only thing you should do differently here is be more direct and tell her "no", and not say you're going to do any of this nonsense for her. I mean, like YOU have to ask the landlord? Her situation is all her responsibility. There is no reason you should feel responsible for any of this. You need to tell her no and then disconnect. She's definitely making noise like she is going to try and stay. People like this get away with things when people like us let them. And you don't have to...as they say around here "No is a complete sentence".

If you want to be a bit kinder, go with something explanatory but non-arguable...so something about you and your feelings or needs, not blaming it on the housemates or landlord, like: "no, that would make me feel really uncomfortable". and then if she tries to tell you how you feel, you shut down the conversation. "No, I already told you how I feel, I don't want to talk about it any more". Then if she keeps talking about it, excuse yourself from the conversation and ask her to leave if she's in your room or leave yourself otherwise.