This time of year it is common to have snakes refuse to eat.
If you feed larger prey, the snakes will eat less often. If she ate well on a 10 day schedule, then feed her every ten days.
How long have you had her? What type of enclosure? How are you measuring temps and humidity? How are you heating it and is it on a thermostat?
If you've had the snake for years and it just now started refusing to eat, it's most likely not the enclosure but the more frequent feedings, in addition to the time of year. But it never hurts to double check husbandry just in case.