I think her fav game theme will be a good one.. since kids luv playing around - so if the hall is transformed into a big play-area with her fav game, she will enjoy it..
LittleDaisy, why do you want to change the theme? Princess theme party is a marvelous choice for little girls. I recommend you to go ahead with this theme.
You can go for Mickey-Minnie Cute mascots.As they are all time favorites,these days you can get Frozen Princess theme.Thanks to the Disney movie for which they even got Oscar.