Hopefully an expert will chime in but the behaviour you're describing does sound like she is hungry. She might need to go up on prey size or be feed more often. Feeding can put snakes in extended "feed mode" where they wait for the next prey for two or three days instead of the normal two or three hours.

When she stares at you, does she do it with her body at about a 30 degree angle? Head looking straight at you? It's a classic, "I'm hungry" look.