Stats on our girl:

Age: ~5
Current Weight: 2481g
Weight Loss: 400g (10-15%)
Tank: 41gal under-bed style tub
Humidity: 60%
Temps: 91F belly, 78F cold side, 82F hot side
Single hide on hot side, water dish on cold

Below is a snip of our data sheet. She's had frequent good sheds for the last 6 months and urates regularly. But is TOTALLY disinterested and possibly afraid of FT and live rats in many sexes, sizes, and colors. We've tried offering in tub with tongs, out of tub with tongs, and leaving it in. The FT is definitely warmed up enough (I use an IR temp gun to check the head at 95F). We haven't tried gerbils but are hesitant to hassle unless it's strongly suggested. Below is also a video showing her disinterest in the rats.

We took her to the vet twice when she was about 3 months into the fast and they declared that her blood work and exam all seemed normal and that she'd need an ultrasound (expensive!) to look for stuck eggs? Seems a little far fetched so we haven't taken her back. Her previous owner was a breeder but reassured us that she was not locked up before giving her to us.

We're starting to feel a bit defeated. Thoughts?