I’m sure this is not the first time this has happened. It’s probably the ten thousandth. Have her call the schools and very politely explain what happened. My guess is there’s a protocol in place for this situation.
What a difference 30 years makes. I wrote my essay and then copied it (by hand) onto the paper admissions form. I left out a line so I made an asterisk and wrote the line in at the bottom of the page.
A mistake was made and I would bet the schools are willing to work with you to make it better. Call.
Just adding: I would have my child contact the reader for our area directly and calmly (and maybe with a little humor and self-effacement) explain the situation and see what they direct her to do. I know this feels like a crisis, but it’s really likely not. Good luck!