Target has a lot of "girly" stuff in their dollar spot. (i.e. Lotions, body butter, lip gloss... etc). You could buy like 4 or 5 things and put them in a little cosmetics bag of some sort. Young girls love stuff like that. They even have 4 different scents, so you can give everyone something different. It's a good idea for a stocking stuffer/filler gift.
You could also get them each dolls and then get 1 doll house that goes with all their dolls to share.