They roam, they do that. Nothing to be concerned about. My snakes always know when it is feeding day... they just know. I am not saying they know how to tell time but it is a routine. Roaming does not mean she is hungry. Would you like to stay in a hole 24/7? No, they do not guard their dens. In the wild they would be in a new den quite often and they do not have a "territory" hence no specific area to defend.