Nintendogs (still her fave , and the one she plays with the most),
Scribblenauts (I actually like this one too),
Club Penguin,
Zhu Zhu Pets and
Zoo World (just eh).
these are the ones my dd almost 8 has
Build a bear workshop not really great
Mario kart wonderful game
two hello kitty games she loves them but she is obsessed with hello kitty
cake mania cool game
tinker bell she does not get all of it so its a little hard
Mario party she loves this one
chicken shoot she does not play it rarely
pet bunnys she likes it its cute
My DD likes most of the games already mentioned - anything Mario or Tinkerbell and Animal Crossing are all favorites. She also loves games that let her design clothes and outfits but she has one that I don't care for - there seems to be an awful lot of rather adult-like drama on it. Don't recall the name right off the top of my head but I'll try to find it when I get home. She loved the design part of it but I didn't care for her getting engrossed in the drama between the characters on the game. There's enough of that in 2nd grade already.
Gamestop usually has little gift tins to hold gift cards that are shaped like game systems. The 360/PS3 ones are a great size for American Girl doll 'houses'.