If she doesn't have a completely clear and clean white belly she is what I suspect she is.
She looks to have the coloration of a malnutrition struck ball python, rather than a pastel.
She looks to be too skinny to me in my opinion, so make sure to get her in a nice enclosure setup and attempt to feed her later.
Feed her f/t. It seems like thats what she was expecting it to be, so get a small rat about the same thickness as the thickest point on her body, and thaw it out for her in about a week or so.
Good luck!