B.B.
Can you put up baby gates in the kitchen entrance or elsewhere other than her bedroom? We had to do that for a while here because of shared rooms.
Our neighbors had a son that sleepwalked and he would walk right out the front door. They bought a little alarm that sells for about $5 that attaches to each side of the door so that when the door is opened this really high-pitched alarm goes off. It has a on/off switch for when they don't need it.