Call and see... You may be able to get something. If it's full in the park, there may be availability for DTD location. If that doesn't work they have the Frozen themed one in HS. There's always the Pirates league too. They have feminine options including a pretty mermaid one, not to mention its significantly cheaper! If you absolutely can't get an appointment, you can go up to the desk at any BBb location and they will "pixie dust" her for free...
Good luck!