Once you have downloaded Doki Doki, you may see a file called Traceback.txt in this file, it contains everything you have done in the game in coding, but deeper down in the file after Sayori's death you may see a certain coding along with a line of supposed speech, there is regular coding up till this point and I assume there will be regular coding afterwards too, the message reads this and sounds a lot like Monika was deleting Sayori and starting the game up again without her, the message reads twice, I assume because the first time Sayori was glitched in but with all parts of all characters, this is the message:
" RestartTopContext: Oh jeez...I didn't break anything, did I? Hold on a sec, I can probably fix this...I think...
Actually, you know what? This would probably be a lot easier if I just deleted her. She's the one who's making this so difficult. Ahaha! Well, here's goes nothing. "