Conversations in the key of "O"

Amidst a conversation with Big O (5yr old) about someone's hair:

Me: How could you see her neck? Her hair is long.
O: No, her hair is short.
Me: I just saw her an hour ago and it was long.
O: Well, I saw her this morning and it was short.
Me: Okay, so it grew long in just one day?
O: Well, maybe it was a long day....

I guess she told me.