Gosh, that sounds unpleasant! I have several bps, and have had them for 2+ years, and nobody's ever bitten AND constricted me. Bitten, sure. Warning strikes and feeding errors, sure thing! But they've all calmed down now--and I've never had one mistake me for food longer than it took to chomp down and get a taste.

I guess I would try feeding her in a cardboard box? And wearing gloves when moving her to that box? And maybe she needs to be fed more often?

What I would NOT do is reward her with food immediately after biting you. I might even go so far as to keep a spray bottle with water nearby, and give her a squirt when she does that. Because seriously, what the heck.

(It's not dangerous, right? She'll never be big enough to threaten you. But it does sound very unpleasant.)