Try waiting for 2 weeks between offerings. My picky BP was helped by this. Also, have you tried other prey items? My girl won't take a rat if offered first. If I give her a jumbo mouse first, then wait ~20 minutes and offer the rat, she will usually take it at that point.

Good luck, I feel your frustration. One of my new BPs (purchased this year at ~100 grams) literally runs from her food and fear-strikes. I'm in for the long haul with her though, as she is a future breeding project animal lol. *sigh*