Beardies can suffer from "relocation stress" when they are first moved into a new home - it can take up to a week or two for them to settle in. You can help by keeping them quiet and not stressing them too much - as tempting as it is to always be watching her and picking her up, it won't be doing her much good whilst she's adjusting to her new home.
A smoother stick might be a good idea whilst she's settling in - once she has her appetite back you might find that she eats everything before it gets a chance to hide!
Do you have any photos of her and her cage? They should show if anything is obviously wrong, so we can give you advice on any changes to make.