Yeah, further confused by it being sex she was getting something out of, namely leniency on her rent. Is prostitution under the influence rape? Is prostitution under duress under the influence rape? Like, it's clearly unethical from the landlady, but it's unclear exactly what form of unethical, and she's clearly trying to become a better person. I'd condemn the hell out of it in real life, but in fiction, kinda complicated, and people can change a lot more easy in fiction.
Coerced sex and sex with someone too drunk/high/whatever to give meaningful consent are both rape.
I'm quite aware of both of those facts. It's not entirely clear to me that she was too drunk to consent, nor that it was coerced. Prostitution is not rape. Again, I think it's bad, and the specific definition or form of badness is not clear, but it's not like her sleeping with her landlady because she couldn't make rent is rape in a vacuum, it's much closer to prostitution. And I'm not entirely sure how drunk she was (signs point to "too much" but still), but it is clear that if that was the only thing going on people would not be calling it rape. I believe heavily in consent in all manners of life, and it clearly was not here enough in this case, but the specifics of it are at least slightly muddied.
That's not prostitution, that's extortion. In fact the landlord threatening to evict someone unless they have sex with them is pretty much the default example of extortion rape. Even if she was stone sober the power dynamic between landlord and tenant is extremely inappropriate without any quid pro quo, that puts it well over the line.