Figured a pinkie mouse was too small. However she is "only" 4.5 months old, I reckoned it was worth a shot.

I also tried giving her a living grown mouse which is about the size as the small rat I bought today. She only hissed at the mouse and was very clearly on the defensive. Why? She tried to bite it several times, but there was no constricting involved. Guess shes not ready to feed just yet..?