Mine love the exact as a treat. In fact, tomorrow morning I plan to dump all the remaining dust from the little feeders into one shallow bowl, pour warm water over it, and top with a generous serving of exact.Initial Reations to Sansa from the Vet
I recall Hazel did eat a tiny bit and Butters just loved the Exact baby bird feed I tried with them. Ate it like yogurt. You could try some crushed fruity Tums or citrate & D3 in with it too in case she's not taking enough oyster shell or isn't metabolizing oyster shell well.
Heat - a heating pad on low, covered with a small towel and then wrapped in Press 'n Seal (a la @Blooie) if she roosts in a next box, or on a bar where she roosts, will work.