Im gonna be honest, im trying to beat it legit, but I still haven't understood how Freddy works. What I do is I just leave the camera watching her but she stills comes into my room. Im definetly doing something wrong.
based on what other people have said you dont need to keep an eye on freddy, you just need to listen for 5 of her giggles then wait 20-25 seconds after the 5th then close the door until you hear her giggle again
Freddy is timer based. I was playing with stopwatch to get 4/20 and she appears always at around 7:42-7:45 of night so I was closing door at 7:38 just to be safe. Open doors after hearing laugh and you’re done for night