I didn't do it

The other day we were driving in the car and Madie was eating goldfish. There weren't very many left so when she ate them all she said "all done". So I asked her if she ate all the goldfish. Her response - No
Me: Then who ate all the goldfish?
Madie: Grandpa

A few days later we had this conversation (also while in the car) -
Madie: All done
Me: Did you eat all of the M&Ms?
Madie: No
Me: Who ate them? (expecting her to say Grandpa again)
Madie: Grandma

She makes me laugh.