I usually crack open the rat's (f/t, not live) cranium when my ball gets picky about eating. They seem to love the smell of brains. It works most of the time for me.

I would also avoid handling to reduce any stress on the lil guy (or girl in your case). Striking without coiling could be a sign that she is stressed out. I also feed in tub and sometimes let the snake strike while he's inside his hide to avoid putting him off his appetite.

I hope that helps. Good luck