Sounds to me like you have no problem, just a normal, healthy Az Mtn. King. I'm surprised you got her to eat this late in the year. My 4 Az Mtn. Kings stop eating between mid-September and mid-October and don't start eating again till late Feb or mid- March. This is the period that they would normally brumate (the snake version of hibernation) in the wild. Mountain Kings live at high elevations that are cold and/or snow covered during the winter, so they hide underground till spring.
What you should do is slowly bring the temps in her enclosure down to the high 40's to high 50's (where I live it is hard to get them below the high 50's for any extended period of time. Basements or garages are good places to do this if they don't get too cold. She will remain active, so keep fresh water in with her. In early March or so, slowly raise the temps back up tp the mid 70's to low 80's, and begin feeding again.