They're living in your home rent free is a whole DIFFERENT story. My 23 year old son came home for almost a year while finishing his degree. I did all the cooking and he did all the errands, all the cleaning, walked my dog twice a day, and took me to my doc appointments. He always made sure there wasn't a conflict before making plans. This wasn't me being demanding either.

You can't expect either to support you emotionally though--it's too draining. If you need to vent do it here or with a therapist. --I'm not saying not to ever discuss things but you have to be careful.

If she's helping temporarily, fine. But she can't/shouldn't change her life's course for you.

If she decides to leave then you can rent a room or two out and use the money to get a housekeeper. You might also qualify for some in home assistance.