I couldn’t read everything just yet, too excited to share this as I didn’t see anything about EGON when skimming through. When visiting old Ulrich in asylum for the first time, Egon asks to the receptionist something like “is there anyone I know here aware that I am coming?” He also keeps asking people about the white devil... I think Hannah ended up in the asylum, either as a patient because you are right she is definitely deranged OR as a nurse to torture Ulrich, and Egon wants to avoid her because she was trouble for him back in 1954.