Maybe she'd been to one of those new stores that are springing up where the kids have makeover parties. I don't know what they're called but my niece went to one that her friend was having as a birthday treat with her pals and they got makeup, nails and hair done. Apparently it's specifically aimed at pre-teens. She's 11 right enough but makeup at five seems a bit strange if it wasn't that she'd been to one of those types of parties.
Unless it was the only way her mom could get her out of the house fast enough too to make her hair appointment, then I'm all for it. I'd taken mine out to town in a Spiderman outfit before in the height of summer.