The more you keep your cams on foxy, the more it stalls her.
You have to keep your cam in bootycove for a minimum of 3 seconds, and have to make sure that she stays in her 1st phase all the time. Some nights, she attacks much faster than normal, and the only thing you can do, is delay her. Your best bet, is to try and stall her until about 2 am at most. After that, she shouldn't attack again, and even if she tries to, you can stall her again.
But in order for that, you have to keep all your main cam focus on foxy, which makes it hard to focus on the other girls. So for that, you have to rely on audio cues of the other girls, and to close the right door at the right a girl approaches your door.