does DD 6 like video games? if not, you'll be spending a lot of time in lines for the few virtual attractions for families, then discover yourself in the "arcade" which eats even more money playing games you'd find at any chuck e. cheese. The other smaller "girl child" friendly option is a create zone, where you also spend money to build your own toy etc.
Now if she likes pinball and motorcycle riding video games then she'll be happy, and it won't cost you more than you spend you to get in.
Last time my DS 14 and I went (I play Galaga for hours in the classics zone) and DH took DD to the movies next door. MUCH cheaper.