Freddy is by FAR the easiest to deal with in fact !
Here's the tips : When she laugh for the 5th times, she will be in cam 6 (bottom right), put your cam vision here (no need to look at her, just put your cam here) and she will NEVER attack you. You now have to deal with the others by sound only yes, but erveryone make a sound when there at your doors, so it's basically free energy gain ! I was attacked by Foxy a 3th time and I win, Freddy just started to sing and boom, 6am.
Try it man, and still good luck.