@Joshua574 I've read your good reviews your host wrote of you and you of her when you were staying in her listings. You now appear to be living in a tent in her garden, under a private arrangement. I assume this because a) the host does not have a tent listing b) you indicated you were paying her PRIVATELY = OFF PLATFORM.
If you are paying off platform, this arrangement has NOTHING AT ALL to do with Airbnb. It is private between the two of you. Airbnb can do nothing to mediate because it's nothing to do with them. If you report her, they will not want to know, your tent arrangement is private, off platform, nothing to do with Airbnb.
It's not against terms and conditions to make private arrangements with ex-guests; it is only wrong to use the platform to make initial contact with a provider, then do things privately, resulting in no commission for Airbnb.
It sounds as if the host let you camp in the garden cos you were homeless & could no longer afford a proper room? - Which sounds kind of her. Obviously I don't know why the relationship has gone sour... But try & see it from the host's point of view; I guess she's having second thoughts about being a homeless charity?
Sad as your situation is, the host owes you nothing. Airbnb guests have NO rights as long term tenants; Airbnb is designed for short term rental, not permanent housing. (But you are not even an Airbnb guest at present!) And if a guest is dissatisfied, the normal way of proceeding is to leave! And get a refund for unused nights.
If the host is trying to manipulate you by reporting you to Airbnb, well, your current arrangement is off platform, so she can't! And as for your previous stays, she gave you good reviews, so she can hardly complain about the times you WERE an Airbnb guest.
It sounds as tho' you need a new place to stay.... Is there no social housing for people down on their luck where you live? - I hope things look better for you soon.