How can she be a bat?

Martha Stewart has a no sew bat costume:

http://www.marthastewart.com/article/8-no-sew-cost...

Oh, this is easy and cute, nice idea!

Get some black leggings and a black dress, maybe something that goes down to her knees. Something with long sleeves, if you can. Then, buy some black material, long enough to cover her arm span. Cut this out into the shape of two bat wings, something that would reach from her wrist to her armpit and then that continues down to her waist, like a large, right triangle. (Sorry if that didn't make sense, wasn't sure how to word it.) After that, you just hot glue it to the outside of the dress from the bottom of the sleeve to the torso, or even hand-stitch it with an easy stitch like a whip stitch. When you're done with that, you could cut out big paper bat ears and glue them onto a headband for her bat-ear, and you're done! You can do her makeup up like a bat, too, and even decorate the costume with fabric pens or something. I hope this helps!

Happy Halloween!

I don't know her size, but here's what you can do. Dress her in tights, and a black dress, or black pants, black t-shirt or turtleneck, black socks, black shoes, and get her a black bat cape.

Or she can be bat girl from Bat Man, get it, and you get the whole outfit.

CUT UP A BLACK SHEET AND PUT IT OVER HER ARMS THEN GET THE LIQUID EYE LINER AND MAKE HER EYES LOOK SKINNY. AND PAINT HER FACE BLACK.