About the same way as the actual fnaf Foxy, tbh
Third night, watch pirate cove about every 2-3 minutes, and get ready when she's fully out (i haven't figured out her audio cues, if there's any)
you don't actually have to watch pirates cove, just look at the cams in general
also her only audio cue is right before she busts in your door it's her running down the hall
