Hello! Welcome to the forum and the wonderful world of snake keeping!!
I did notice a few things, I'll just go in chronological order of your thread:
- the ambient temps need to come up a bit. 75 should be the absolute minimum. In order to achieve those temps it's important to understand that your UTH is there solely to provide a hot spot and not for ambient temps. So, unless the room the snake is in remains at a constant temp in the lower 80s you'll need an additional heat source. You can use a lamp with bulbs or CHEs.
- as for feeding, fuzzies are WAY too small for a BP. They eat hoppers right out of the egg for their first few meals only, typically 3-5 meals, and quickly move up to small adult mice.
You also may need to tweak the way you're heating. With a water temp that hot you may actually be cooking the mouse. Try lowering the temp to something that feels warm, but not hot, to the touch.
Also, don't bother with braining. You want to be consistent in the way you offer. So, heat an appropriately sized prey item and offer. If refused, wait a week and offer again.
- on to handling... You seem to be doing fine there. Keep handling to an absolute bare minimum until the snake has eaten three consecutive meals without refusal.
BUT, I did notice one MAJOR issue. Do NOT move the snake to a seperate feeding tub. Feed INSIDE the enclosure. Feeding tubs are old school and proven counter productive over time.
Transferring to a feeder tub will a) increase the chance of a refusal since moving the snake can stress it.... b) increase the chance of the snake regurgitating it's prey due to the stress of the snake being moved after it eats (if it eats) and ..... c) drastically increase your chances of being bitten since the snake will be in feed mode (this can last 24+ hours after feeding).
- lastly, her behavior indicates she's hungry. That would make sense since she's only eaten 1 meal with you and the prey item was way too small.
Try getting appropriately sized F/T prey and defrost in warm water, not hot. Feed at night IN THE ENCLOSURE.
Hope I helped. Feel free to ask any questions you may have.