The dirty dishes routine might backfire -- you could run out of dishes before she actually does any cleaning, and then what do you do when you want to eat? Unless you hide clean dishes in your room...

I'm really not sure what to tell you. I wish I had better advice. This sounds like a really crummy situation. But just keep in mind, there are other cute, sweet houses to live in with better landlords and better roommates. It does sound like this landlord has a knack for attracting people who shouldn't be living together into one house...

Good luck. I hope you are able to find some peace.