I'm trying to help my kid who is playing Undertale. She finally defeated Muffet after a year of playing, and then there was a glitch and nowhere for her to save file.
She was in the Hot Lands and Mettaton Box form was fighting her. She defeated Muffet then the game locked up and there was no save file anywhere for her to save the file to.
If she was killed by Mettaton her last save was before Muffet.
How can we recover this progress?