I believe I've figured out a solution. If you apply this patch to your game you should have an option in the debug menu called "Cannot start dungeon 5". If you select it and choose to activate it, Brittany should disappear and you should be able to interact with the other receptionist. The debug menu is accessed through your key items. https://mega.nz/file/tHQAhJiT#8mYQsjyeccqz042FF76YjF29gTCgcCNggK4fyZAthnw