Your snake is too young for brumation (snakes don't hibernate). Keep the heat up and continue feeding her. You may have to compensate for the cold temperatures of the cool end by making it slightly hotter in the warm end.
However, if she doesn't feed, don't panic. Turn the heat up a little, and if that doesn't work, offer her food every couple of weeks. Many snakes typically go off their food around this time of year.