Try and find her owners. Most likely there is someone looking for her, as she doesn't look mistreated/underfed/etc.

Here's Petfinder's lost ads, you can also place a found ad.
http://content.petfinder.com/classif...d.cgi?state=TX

I wouldn't place ads stating she's a Pit Bull/mix - place ad with "young female dog, red & white" etc. Because she is part Pittie, be sure if the owners do show up that they provide proof of owning her (pictures, etc.)