if she is taking them fine i think when you move up to fuzzies she will strick. if you think in the wild that size mouse wont be moving anyway so why strike
the amazing colour of the cornsnake, as it glides through the feild, never a mistake so as not to wake the hapless prey before it, this may as well roll over and close it's eyes as the silent hunter shall always get his prize. the forked tounge can smell you mouse,red eyes can see you stir, if she does not wake and run now, that will be the end of her.