You can definitely overfeed them--and some of them will take it. We have one roughly 1000g girl that would take two to three rats a day if I gave them to her. They can get fat, though, and some balls will also slow start to refuse meals if they get too many. I've had a couple of males do this, especially when they're already full sized like your girl is. Basically, unless you are breeding her, there is no need to give a full grown girl more than a decent sized rat a week. They don't burn all that much energy on a daily basis, and when she's not growing or building eggs there's really nowhere for her to put it. (Note that even if you are breeding her, 2300g is a decent size, and you still wouldn't really have reason to feed her any extra). The only time we feed ours more than one a week is when one of our babies doesn't eat and we have leftovers.