I would put her in a 6 quart tub if possible and feed her live hopper mice or a live rat pink. Some will nail one(rat or mouse) and not even look at the other. As far as feeding F/T you need to get her to become an established feeder first and then once you have a good feeding response, think about conditioning her to eat F/T.
I never let a hatchling leave until I see 4 continuous feedings. I feed mouse hoppers or rat pinks for the first meals. Mice pinks are for baby corns, too small for BP's. All my babies are started in small tubs where they will feel secure. 10 gallon tank for a hatchling that isnt established can be overwhelming to her. This is why you dont sell a snake until it has had a few meals first.