Larger prey items seem to make snakes grow faster, or even feeding them smaller rodents every 5 days works out just the same. Just last week during feeding time I had a few snakes take down some large rodents and now they're all in shed LOL.

The rule I go by is that I feed a rodent about as large as the middle part of the snake's body.. so far things have been working out pretty well.

But whatever you want to feed your snake is entirely up to you if you feel the snake can down it. If you're not looking for your snake to grow faster then probably sticking with what you've been feeding her is best. If you're trying to get her up to size quickly for next breeding season, getting a little bit bigger rats wouldn't hurt.