In normal FNAF, Foxy requires the cameras be active (not neccessarily at Pirate's Cove) frequently enough to "stall" them. While Freddy can be "cam-stalled" by keeping the camera on the lower-right camera spot, even if you're not looking at it...
In this game, Freddy's "Cam Stall" doesn't work, so you'll have to just keep the right door closed until she leaves. I'm *moderately* confident that Foxy acts the same, but if you're wanting to be certain, just poke Booty Cove every so often!