It sounds like your girl is fine and probably just holding it in. For what it's worth, my almost-five-month-old Sonoran hasn't gone since mid-November even though she's had five meals and drank plenty of water in the interim. She just came out of blue and is getting ready to shed, so I have a feeling the long gap was due to her fueling a growth spurt. Perhaps your girl is getting ready to do the same. She may also be holding it in a bit because she's still hasn't quite settled in from her move. Either way, I don't think you need to soak her again. If she feels the need, she'll probably just soak in her water bowl herself.

Your feeder size sounds fine from what you described. My girl wrestles with her food the same yours does (and her f/t hoppers barely leave a bulge anymore), so it's not really a matter of the f/t pups being too large as much as it's a young snake trying to figure things out.