The medium mouse is as big as her largest part of her body. I'm not saying I'm not going to take your advice, but again, using several ellipses appears condescending and it making me not want to trust you, regardless if your info is good or not.
If someone else pipes up and says "Yeah they should probably be on pups by now" despite her literally just breaking 400 grams a few weeks ago. I'll go to my local pet shop and grab a few rat pups to see how she'll handle them.