All I can do is guess, based on what seems like common sense to me...but I don't have any experience with this sort of thing.
I would imagine that a somewhat gradual warming would be better than suddenly thrusting the snake into a 90 degree box. Maybe put the snake into a secured pillow case and hold it against your body for awhile...then after its warmed up some from that...put it into its enclosure, making sure it has a good choice between "cool" and "warm." Even the "cool" end will probably feel quite warm and toasty to her.