She looks to be in good condition from the picture (size wise) for not having eaten. Have you reviewed our caresheet here yet? There's a section on "Why won't my snake eat?" in there, and it has a good check list of things you can "correct" in your husbandry.
I'd recommend moving her to a smaller tub set-up for now, allowing her a week to settle in, then set a critter keeper with a live mouse or small rat pup next to the tub for 30 minutes to pre-scent the area. When you see her peek her head out of her hide to find where this scent is coming from, drop in the live prey into her tub and let her hunt from her hide.