M.M.
Craft kits -- like latch hook, friendship bracelets -- there are tons of these in WalMart in the craft section.
An experience gift -- movie/dinner date with mom, ski passes, bowling or whatever she likes. You can make a coupon and wrap it up in a box.
Books -- The Daring Book for Girls is really cool and has lots of short things to read and do in it. Crossword puzzle books or word search books.
Board game or other handheld electronic game -- There is a little handheld 20 questions game that claims it can guess what you are thinking -- you think of a thing and it asks questions you answer. It is very cool and a big hit with my kids. Simon is also fun if you can stand the beeping noises! Bananagrams is fun if she'll have someone to play with.