its based off of pure rng luck timing and exprince js cam stall and when she leaves her cove close the door and then watch her run it will consume less power
if you look at the hallway cam to trigger foxy running she will take very little power, if you instead just wait for her to run on her own she will take like 20% straight away. I was doing it on 4/20 and at first didnt realize why tf she was draining so much power