Housemate has vascular dementia and is volatile

I moved into a house and was not told by the family the woman has vascular dementia. I was just told she has some memory issues and is sometimes confused. The family claims they did not know she had gotten as bad as she was as they live in another state. I admit nothing seemed way off until a week after I moved here and she started having volatile verbal meltdowns over nothing. It has been 7 months of hell as she has shown how bad she can get (stealing, hiding things, lying, letting my animals run loose, etc). I am on a wait list for an apartment. I don't know how to keep it together until I can get out of here. It's crushing me.