I would not feed her another mouse, mainly because I believe constancy is important with snakes. This makes it easier to monitor feedings as a keeper, and is useful if you snake ever gets sick or goes "off feed". The consistency is enough that with my bullsnake he'll sit and wait with his head just inside the hide exactly on feeding day(and roughly the time of day as well), waiting for the "visual que" of the feeding tongs and tray. What I would do in your case is up the mouse size a little bit next time, giving her an offering that is 15% of her weight,(16g I think?) making sure that it isn't wider than your snakes widest girth of course. Additionaly if you feed her in her cage, starting to do it in a separate area may also help. (Says the guy that does exactly the opposite of course, lol) also, believe it or not, snakes can get fat too, so over feeding should just be avoided all together.