My son gave me a hand made valentine with coupons that he made. The coupons were good for chores such as a car wash, breakfast in bed and one night of doing the dishes after dinner. It was the best gift I've ever gotten!
Do the dishes and other chores until you move out. She would probably REALLY appreciate that. Stop and see what she actually has to do all day long. Might make you want to help out even more than you do now.