Did she strike and pull her head back again, or strike and left her neck stretched out? It could be a defensive strike, which often "misses", because they weren't going for a coil. From my one BP who goes on feeding strikes, when I pressured him too much with the feeder and he didn't want to eat, he would strike at it defensively.

Sometimes feeding strikes miss though. I just pick the mouse up and offer again, and they coil it right away.