After reading the title, I thought "oh this guy isn't feeding warm prey!". I've seen BPs strike multiple times at a thawed feeder and miss, and just get frustrated, because they can smell food, can see food, but their heat pits don't let them zero in on colder prey so they miss.
But it sounds like you take good care of your snakes and the rest of them eat well, so I don't really know what to tell you..
I mean, it's summer and she's not in blue, she's kept in adequate conditions that are the same as other snakes you have.
If you don't have any, you MIGHT try putting a hide in the tub. I know some people don't use hides in tubs, but your snake might enjoy something a little "tighter".
Other than that, good luck with her.