Hi, I would agree with the previous poster. Let her be silly and play along if she knows the answers and is bored. Most adults will know by her grin or giggle that she is being silly. DS4 still does it when watching Go Diego Go. At the end there are questions about an animal and he shouts the wrong answer thinking it's funny. I think your MIL is proud of her and wants her to show off her skills, maybe.

Jen