I thought there was a minimum wage in the US and didn't they recently raise that? I thought it was something like $12-15 hour? If she doesn't get any wage, fair enough but even then $80/shift isn't bad. I've worked decades in this business and then dropped it after COVID. Fun fact, I was getting 10 Deutsch mark an hour 30 years ago and today the minimum wage in catering is €13/h. So an average shift will net you ~60 EUR plus tips which are basically not worth mentioning these days.
So yeah, I'm not working for €13/h with 30 years of experience, hotel training, graduation as restaurant professional and thousands invested in my Cocktail trainings and certificates. I make more money staying at home.