What happens if you put Sayori back in the folder
-------------------------------SPOILER_______________________
1. Start a new game optional
2. Open the game files and choose "characters" and copy Sayori's character file "Sayori.chr".
3. Paste it on your desktop
4. Play until Sayori hangs herself, wait until the "end" text pops up
5. go to the menu and drag Sayori's file copy back into the characters folder
6. restart the game