It *just* happened.
She was enjoying her time out of cage, but was starting to get in trouble situations, resulting in a lot of interventions to get her to stop doing bad things.
I looked at the time, and figured she had been out for nearly an hour so I told the Boy that it was ok to put her in her cage with her breakfast.
In conjunction with me saying that, he quickly picked her up, so that he had her in his hands by the time I was done talking.
That is when Léa let out her first clear "NO!"
The Boy and I looked at each other, laughing. There was no mistaking what she had said.
Ironically, I don't think either of us really said "no" this morning while she was doing things she shouldn't be doing.