Explains Jeannette's mother's statement that sexual assault is a crime of perception (pg. 183-184) what is the contrast between what her mother should have done vs. what she actually does?

Rose Mary is insinuating that one person's sexual assault might be perceived in a totally different way by someone else. Rose Mary's job as a mother was to protect her child.... she fluffs over the incident and excuses the sexualt assualt on her son.