Hey Laura,
Very good to hear she is at least eating the pinks heartily! I did understand that she is about a year and a half old, which is what led me to believe that she just wanted to go into an early brumation for some reason and shut off on feeding when she did. The 4 months is about how long pyros and other mountain kings brumate in the wild and don't eat.
Normally in captivity when they begin to shut down for the winter, they begin getting really picky with their feeding and refuse their normal sized offering and will only reluctantly accept something significantly smaller. After brumation, they warm up slowly and begin feeding again... also on much smaller food items such as your girl seems to be doing. Once they get going good in early spring they will begin taking their normal sized meal items. I think everything with her is normal, and since she is eating the pinks readily she is only doing what mother nature is telling her to do... she just got started with her attempted brumation a little early.
If you had a supply of frozen small and large pinks on hand I think your troubles and expense would be over and she would soon begin accepting the f/t fuzzies again. Some of these critters can be darn stubborn when they want to be and the only relief is to give them what they want. Pushing them too hard to get them to do what you want them to do against their will can make matters worse. I have been down that road and back a couple times and believe me, I understand your frustration! Once you understand them and what nature wants them to do, the whole thing becomes much easier and MUCH less stressful! lol!
Keep doing what you are doing to keep her eating, get her started on f/t pinks soon and she should start on the small f/t fuzzies soon after. Good luck!