wouldn't it make sense... (spoilers)
After she shot the man, wouldn't it make sense to do a perimeter search of the wall at least around the area closest to where he appeared? The man came through the wall most likely, unless you believe he always lived inside, which is highly improbable. So even if she didn't care about leaving, she should've had an interest in security, cuz other deranged people might make it through the wall.
Comfort the disturbed and disturb the comfortable