Your best bet is to leave the snake in her enclosure. Don't use a seperate feeding tub, don't use a bag. You're just stressing the crap out of your snake.
Let her eat where she feels comfortable.
There are two main reasons a new BP won't eat.
1) husbandry
2) stress
In order to help you determine which one, or both, your snake is dealing with we'll need to know more. But off the bat, your snake is stressed from being moved. Stick to offering in her enclosure. Stick to a routine. Every time you move her or change the routine it stresses her out.
Also, you may want to start with a smaller enclsoure, 40 gallons are huge for a juvenile BP.
But, like I said, we'llneed to know more to help you
1) how are you heating the enclosure?
2) are your heat sources regulated by a THERMOSTAT???
3) what are your temps?
4) How are you measuring temps? And where?
5) is there tons of clutter in that huge tank to make her feel secure?
6) are the hides the right style and proper size?
7) are you handling the snake (aside from moving it to try to feed)??
8) is the enclsoure in a high traffic area of the house?
Also, fuzzies are WAY too small for a BP. BPs eat hoppers fresh out of the egg, and only for their first 3-5 meals typically. Then they quickly move up to small adult mice.
Remember, the more you tell us, the more we can help you and your snake.