Whatever she's eating is fine, as long as she's eating on a consistent basis(weekly), is maintaining her weight and is thriving.

2-3 adult mice is the same as a weaned- small rat. Gram for gram, there is no difference in feeding one over the other. I have adult females who take down 4-5 adult mice in one sitting and grow like nobody's business.

If she's soaking, she's either: too hot, insecure(hides are not correct), has mites, or is trying to digest too big of a meal.