Are you feeding ft or live? I have had an issue in the past of switching from ft to live for just one feeding. That snake never ate frozen thawed again. Also you can try ASF rats. I usually get a response that way. If that doesn't work try a large mouse. Sometimes switching to a smaller prey item will trigger feeding. As for the duration I wouldn't be concerned. Ball pythons are picky eaters to begin with and something as simple as the changing of the seasons can cause their feeding response to slow. If she is set in a location where she is subjected to natural light and the ambient room temp is lower then it was a few weeks ago she can be naturally cooling. I do not keep my balls in tanks for this reason only racks so I can control their temps and light better.