Lost 25 grams, what now?

My 2 year old female has been brumating for the past 2 months due to the negative temps we've had here, despite her tank and the house being the same. She weighed 111g before burying herself. She came up 2 weeks ago and I tried feed her then to no success. I weighed her then and she was 98 grams which was concerning, but still looked fine. Came up again today, and is now 86 grams and she is starting to look underweight. She was up to small adult mice but I sized her down to hoppers the last two times. She is currently roaming her tank but preferring to stay on the cool size mostly and ignoring her mouse. Cool side is 80F, hot is 94F on basking rock. She has never refused food for this long before. She is also super friendly and never minds being handled before eating so that is not the issue. I know if they lose weight like this, it could be a vet issue, but what would the vet be able to do? Anything I can do? TIA for any help, I'm very anxious about my baby