Hi elvenprincess, welcome to SuperCheats!
You need to go back to all of the Rooms that you've already been in to and, using the Radar in the bottom right hand corner of your screen, find the Boos; once you have 5 of them, go to the Washroom - it'll actually be unlocked now and you can get the Key from the Toilet to the Fortune Teller's Room!
Good Luck =)
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