Fuzzies are too small for a even a hatchling. Bump up to small adult mice. Should be about the same width as the thickest part of the snake. A little thicker is okay.
I do f/t less risk.
But What my balls don't eat my boa accepts
I guess I don't understand why she would "freak" lol. just lay the feeder in there and see if she'll eat it. Or you could try feeding a couple fuzzys at a time until she bulks up a little more.