If she only accepted once this is not what I call a F/T feeder, I when I sell animals that feed on F/T they need to feed at least 5 consecutive F/T meals before I claim that they feed on F/T.
Two important thing
Make sure your husbandry is on point which mean tight environment 6 quart tub or 5 gallons tank for a 3 months old animal.
When offering the prey if F/T thaw at room temp near the enclosure, than warm up with a hair dryer.
If P/K warm up with a hair dryer.
The most important is to make sure that it is warm enough and that you hold the prey with your feeding tongs from behind the neck (not the tail) and move it around as if it was alive.