I am going. For one reason only. It has a rolling picture of the fair on the main page and the first one that came up was two ok looking women with the byline of "Cowboys aren't the only ones who ride at this rodeo."
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Thornton rec center has about the best playground ever.
childrens museum is very interactive. Lots of fun for kids, especially her age.
Aquarium, zoo, history museum, baseball game.
She might even enjoy helping you wrench on cars, you never know!
Wild Animal Sanctuary is cool
http://www.wildanimalsanctuary.org/
Butterfly Pavilion or Tiny Town maybe???
http://thewildlifeexperience.org/
This place is in Parker and pretty cool.
http://www.serenityspringswildlife.org/
http://wolfeducation.org/
http://www.worldwariiaviation.org/ - probably not a girl thing, but you never know.
Tour the Olympic Training Center.
Starsmore Discovery Center
Monkey Bizness. Good way to drain some energy.
http://www.monkeybizness.com/
Really? That's sad, I remember having good times there as a kid ~20 years ago or so (not that I remember what those good times WERE, just that I enjoyed it lol).
If you're willing to drive, they recently (within last year) re-opened the Discovery Center (or "Fort Collins Museum of Discovery, as I guess it's called now) up in Fort Collins. My coworker said his kids enjoyed it, and they even have a neat dome theater in there which I've checked out. http://www.fcmod.org/
Don't forget a brewery tour day! Avery, Coors, New Belgium and the like....
Erm, brewery tours aren't exactly 5-year-old friendly. Perhaps a young teen (even if they don't get to sample), but I think 5 would just get bored.