M.K.
If she is in to Fancy Nancy, there are some "Easy Reader" books starring the fancy girl with a fabulous vocabulary (she may be still into the picture book stories, too)! A pretty dress or springy skirt and new cute socks wouldn't be a problem for her brother, either. My 7 year old son loves the novelty of Twistables crayons and draws like crazy. You could also go for a fancy journal with her initial on it (they have them at Michael's). My fancy 4 year old LOVES silk flowers (because they don't die), and I got her a bunch from the dollar store so she can decorate her room. Have fun deciding!