i thought my girl was staying in the cool side hide box all the time too and thought there's something wrong with that until i actually saw her going into the warm side hide box late one night. my girl has a habit of staying in the cool side hide box for the 1st 24 hours after a meal before switching to the warm side for the 2nd day and then going back and forth on or around the 3rd day.
these snakes are nocturnal so chances are she's moving back and forth at night and you just happen to be catching her when she is on the warm side.
i'd say if you KNOW your temps are good on the warm side then she should be ok spending alot of time there.
it may just be that your girl just likes to be nice and toasty warm...i know i do!