She didn’t , but she was going to in a future episode.

More animated Emma.

She was intended to appear if the show hadn’t been cancelled.

I’m slightly surprised you could get through this post and not mention Power Girl.

And as for your dilemma, this seems workable without being overly sexualized:

For little girls, a more age appropriate version of the Rogue costume can be made from black leggings and turtleneck. The belt can be worn at the waist, since girls won’t have hips. Black gloves can be found in the fall at most discount stores. If you have concerns about using hair color on a young child, purchase a wig at a costume shop and apply the white streak to the wig instead. For safety outdoors, use fluorescent paint to make the “X” on the belt buckle and add some extra “X” markings on shoulders and at ankles to add visibility to the costume. Black is elegant for Rogue, but children should not be invisible on Halloween night!

It’s also much more coverage than her previous foray into Sailor Moon dress-up. Most of the skin-tight or skimpy suits that are popular for superheros don’t translate well into kid costumes, though — at least not for anything to be worn on a chilly October night!