Was Ben Ever This Ornery? I Think Not

Rebecca's favorite phrase, which I hear literally 50 times a day (which is impressive considering she's at preschool during the week) is "NO! MY DO IT!" Or some variant thereof. When I try to help her down the stairs. Into her car seat. With her clothes. Her food. Her seat belt. Brushing her teeth, her hair. Even when I try to READ to her for crying out loud... She yells "MY SAY IT!", grabs the book away from me, looks at the page, and tries to repeat what I just said. It makes reading a book to her very difficult. In fact, it makes DOING EVERYTHING VERY DIFFICULT!