Feeding in a separate enclosure is one of the oldest persistent myth when it comes to BP, the reality is it can be stressful enough for a BP to lead to refusal but it also put YOU at higher risk to get tagged since BP can be in feeding mode hours prior and after a meal.
The key with F/T is to have the prey warm enough, thaw at room temp near the enclosure (this will help entice the snake to eat) and warm the prey up with a hair dryer concentrating on the head, grab the prey from behind the neck and move it around as if it was alive (obviously in her tank.
Also to keep in mind you only have had her for 2 weeks and have offered food 3 times over the last week, the more you offer the more it will lead to refusal, if your snake refuses food only offer again on your next feeding schedule a week later.
Until she eats at least 3 to 5 times for you I would recommend you not to handle your BP except for maintenance.
Make sure your husbandry is optimum, roper size enclosure, proper temps, optimum security etc