well, I know this is a far cry form being a teacher, but I'm a substitute. I would never say or do anything in front of those kids that I wouldn't do or say in front of my own. In the class or out of the class.
I would say if your mom is tired of being responsible for children, maybe being the adult in charge of children upto 8 hours a day is not the job fer her anymore.
My kids saw Heidi on TV. They think she is skanky. They told me they would completely lose any respect they may have had for a teacher if they acted the way she idi (not just the stripping, but throught the show). Once a student loses respect for a teacher their ability to be a good teacher hits the floor.