predator678 wrote:Depending on its size, you could try cutting a small opening in a container, barely enough for it to fit through, and place a large prey item inside. The hope is that the snake eats it and then can't fit through the hole to get back out.
Just make sure you check this more than once a day, the snake can get injured or die if stuck like this.
Check the cage again, sometimes they fit in behind or even in a light fitting or somewhere and you think they got out.
Also, Rainbow Boas can dehydrate very quickly so put a few bowls with water all over the room. They dehydrate even with water if not enough humidity when small though. How old is she?