Your mom had you when she was young... Anyways, my mom always gave me like 40 bucks to spend on her. But the best thing to do? Go over to the house of one of her friends, get some more of her friends, and bake a cake ro something. Ask her to pick you up, and surprise her with a party! WHat I did last year, she still hasn't forgotten it.
Home made or custom things like a sweater that says "love you mom" or something unique. A charm bracelet too in kays they have some really nice ones and arent expensive. Or get more people like her friends and everyone pitch in with food and drinks and such and make a party for her
makung her a meal would be nice...run errands...basically give her a day off. Handmade gift cert. for a housrclean...anything she wants. If thats not for you, how about a good c.d. with hits from the 80s or90s?