If it's any consolation Tone, I've had the same experience with a few young (6-12 mos) N.A. milks and even a couple of tropical milks which had been ravenous feeders then either refuse to feed altogether or accept only large pinks.
I've tried waiting it out, changing the temp a few degrees either direction, larger or smaller cages, different feeding times, etc....but finally accepted that the animals behavior has simply changed and will probably revert to the previous feeding behavior eventually.
But I still have to consider that there's something in the husbandry that is the root cause of the change and continue keep that suspicion in mind.
So she's eating pinks now and that's good news - breed her and see if that hits the reset button. And offer small brained fuzzy mice - another weird preference is for brained mice only.
I hear your pain!
Jeff
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The rich require an abundant supply of the poor. - Voltaire

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