i have the same issue with my bumblebee.....i know she's hungry because she's always in hunt mode.
the only way i can make her eat is if i restrict a rat by holding its tail. she loves stalking the struggling rat, she coils her neck like a spring and eyeballs the rat for minutes before finally committing to strike. this is impossible with a free roaming rat because she is very head shy and immediately hides when the rat comes anywhere near her snout. i've tried fresh killed, she will have none of it even if i do the zombie dance. i'm trying to turn her into an agressive eater by offering rats every few weeks only, it's not doing anything.even if she's very hungry she always needs an eternity of posing before she will finally strike.