Playing Tricks on Me

Kaylea has been playing trick on me. She has learned to roll from her back to her belly. However, she will not let me see her do it. At least four times today, I had her on her back, left the room, and when I came back, she was doing tummy time. I am not sure why she doesn't want me to see her roll over, but clearly, she does not. It seems like everyone has seen her do it, but me!