What is the main conflict in Perfect You by Elizabeth Scott?

Perfect You follows the main character, Kate, as she tries to put the pieces of her life together after her dad quits his job to sell vitamins at the mall and her best friend from childhood becomes popular and dumps her. Kate's father, Steve, quits his full-time position when he goes into work one day and finds that his desk is broken. He opens a booth at the mall to sell "Perfect You" vitamins. Kate and her college-graduate brother are forced to work at the booth with their dad. The problem is that everyone at school is making fun of Kate because of her dad.