Just remember the mouse fulfilled it's natural role as did your snake. We humans with our "messy" emotions sometimes get in the way of that but in the end Mother Nature's creatures do what they are intended and designed to do.

If you do prefer f/t feeding, then perhaps down the road when the snake has a good, established feeding pattern down and is showing nice growth you could always try to switch her over then. Just remember for now while you are feeding live to never leave a live prey in there with her for more than 15 or 20 minutes tops (unless the prey is so young it does not have erupted teeth yet) and to be very choosy about where you buy your live prey. Since it's the only source of nutrients your snake gets, it should be the best you can find.