Her daughter is angry that children can be so disrespectful and mean.
"It's very hurtful," Michelle Hawkins said. "It would be hurtful to anybody."
Klein also remembers one of the students hitting her in her seat.
"I only felt him hit me once and it wasn't hard but on the film it was more than once," Klein said.
She believes the students should be punished.
"I don't know if they can be charged," Klein said.
Greece Police have interviewed four of the students, but none have been charged yet.
The Greece Central School District said its bullying team is investigating and the students will be disciplined.
Klein says she regrets not doing something more when the kids started acting up.
But she hopes everyone will learn from this.
Klein has worked for the school district for more than 20 years, the last two as a bus monitor.