That tells me you should do a total check-over of your tank specifics: temps, humidity, substrate(and depth), cover, and furniture. Especially hides. If she prefers that shoe it means she wants hides that hug her and make her feel secure.

Some snakes want tighter hides than others. My young normal female seems to like space and prefers medium hides, while my pastel male likes his tight hides so much he 'complained' like yours was doing when I tried to update them (so I left him the old small ones).