After you have corrected your husbandry, don't try feeding your BP for another week and don't bother her, just so she can lay off some stress and get used to the new enclosure.
When you do feed her next, try feeding her pinkie rats. If the pinkie rats are too small, try rat pups. These two rats cannot see and they cannot bite your snake, so it's completely safe to leave it in the enclosure for your snake to get on its own. When you do feed, feed at night. Put the rat in the enclosure, turn off all lights, makes sure it's dark in the room, and close the door. This way your snake has privacy to hunt and eat without someone standing there watching. They also are most active at night, so keeping all lights off will really help.
This method helped me out when my Dumeril's boa refused food for two whole months. Hopefully, this method will work for you.
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