It's wrong to invade someone's privacy.
Mary and her daughter Winnie are both at home as the evening approaches.
Mary wants to know if Winnie has a crush on any boys.
Mary asks Winnie if there are any boys that she likes?
Mary sneaks off into Winnie's  bedroom and opens her diary to read it, in case it has some juicy tidbits.
Winnie tells Mary that there is a boy she likes, and she's happy her mom is taking an interest in her love life.
Winnie sees Mary reading her diary and recoils in horror and instantly feels violated.