Odd. I'd keep an eye on her for sure. How long ago did you move her to her new tub? Normally when they are going to throw it back up, they do sway side to side and do a lot of opening and closing of their mouth. You can normally see them pushing the food item back up too. She is not making any kind of wheezing or popping noises is she? No bubbles coming from her noise or her "drooling" with snot. If no signs of a R.I. I'd keep a close eye on her. If she does regurg it back up. Do not handle her or disturb her for a full week, and try feeding her again in 7-10 days. Feeding her again before then can result her in reguring again and every time they do it, the acid in their stomach messes up the lining in their throat. So you gotta give her a few days to chill out and heal up.

Best of luck, keep us posted!