Because they can jumpscare you if you are watching cams and then close your monitor, so if you see them on cams and then close your monitor when they are at your door, then they can instantly jumpscare you.
She can still jumpscare you from the left door if you run out of power, except you really do anything about it, since without any power everything goes dark and you can only just sit and wait.
She can jumpscare from both doors. If you don't keep your cam on her much, she will come to your right door. If you run out of power, she will jumpscare you from the left door, and you will have no way to stop her from doing so.
