i think you did well! separate enclosure feeding often brings stress, but i see why you did it. maybe wait for her to be sticking her nose out of her hide at night to try and feed: this usually means they're hungry. i usually thaw the rat in the fridge, then place it in the room they're in which scents the room and gets them in feeding mode, ready to strike. did you leave the mouse in the enclosure? if not that's okay, maybe try it next time.
hey, you tried to feed a snake! 😀