I don't think shes getting thin; although the pictures are a little dark. I wouldn't be too strained to be surprised shes not eating yet. Make sure that her enclosure has the right settings. Also, have you been handling her a lot? Hatchlings in particular do not like to be bothered much.

Make sure her hide/hides are appropriate for her. Are you feeding inside or outside her enclosure? Things like this are questions that will effect her feeding habits.