Allan makes a good point on the parasite issue...
In terms of going off food, not often from my experience although I have read differently, but I have one that does it this time of year regularly. She doesn't go off food completely but changes to eating once every 25 to 30 days instead of 10 days. Only thing that changes for her is that it gets pretty warm in the room they are in.
Its possible its a husbandry/enclosure thing if you are saying that she only took a couple of feeds and then stopped after being moved in. BTS can be rather touchy when being moved around and while she may have felt secure in her tub, something may have clicked in her brain to stop feeding.
The above is just speculation though mate, some BTS are finicky and just choose to do their own thing no matter what you do. My only bit of advice is not to change too much too quickly while trying to figure it out.
Just out of curiosity, are you just leaving the mice in there for her or how are you offering it?