My best suggestion would be to bring the humidity down to 45-50% to start, assuming she's not going into shed. With the weather being cooler, higher humidity can trigger mating behaviors, even in sexually immature snakes. That could explain the odd feeding changes. Seasonal barometric changes may play a part as well, although I don't know that it's been conclusively proven. When you're feeding frozen, try to mimic the behavior of a live rat when confronted with a predator. Get it close enough for her to smell, and then move it away. It's goofy, but it sometimes does the trick. Another possibility is that she's just not interested in frozen anymore. No explanation for it, wierd stuff just happens sometimes. You might just have to switch to live.
If you check her belly and find nothing wrong, consider changing your substrate. It's a long shot, but snakes have sensitive bellies. I had to get some faux wool blankets from some paramedics because Ajja freaks out if she's cruising around on one of my soft fuzzy ones. Of course, she IS a bit of a diva. She also won't drink warm water. Room temp or she's not having it.
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