since i havent seen any new posts to this ill give my completly unprofessional opinion

it sounds to me like you may be trying to hard and changing things up too much, just leave the cage set up and dont move or alter it give her about 3-4 days to get use to it then attempt another feed. hopefully she will not be stressed out by then.

another small suggestion is not to remove her hide when she is in it less its to clean the cage or replace substraite. its there home and private place and dont enjoy invaders. however i would suggest getting the hides that press right to the glass so you can see in. i think its called exo-terra? they look really nice and reptiles do love them however there magnetic and you must be very careful replacing the magnetic outer shell as you can accidently pinch a tail tip which is extremly stressful. my suggestion is to put the hide up to the glass and leave it there without the outer cover. your snake will still feel secure and no pinched tailtips or unfortunate flickering tounge. can tape a peice of black paper over it if you think she doesnt feel like there is enough privacy in the hide with traffic outside. then just lift said paper to view in on her