It sounded like you were feeding F/T, or maybe you even mentioned that. One thing I have noticed from my BP is that the mouse has to be up to temp for her to want to eat it. I dropped in a thawed but room temperature mouse and she knew something was up, her tongue was flicking around and she crawled all around and even right up next to it, and was in that very aggressive hunt mode. However she didn't strike and eat it. I didn't know what was going on.
So I used some tongs to extract the mouse and ran hot water over it and tried again and she snagged it right away. Gotta get that mouse temp up or else they won't "see" it with their heat pits.
Now that she's older, it seem as though high mouse temperature up or not, our BP will inspect the mouse for 15 or so minutes and then just casually begin to eat it. No striking and constricting.
Ironically, I actually heated up this mouse a little with my hair dryer this time- maybe it was too hot. She struck faster the last two times just warming it with water. Im sure it will just take some time to learn her "quirks"
thanks for your input!