I don't know that word

A few nights ago Leah and I were talking about being obedient, and how it was important to listen to what mommy says. I said "Leah, you have to obey mommy and daddy". Leah responds "Obey? ...I dont know that word"

Then last night (Sunday) she randomly asked me as I was putting the girls to bed:
L: Is it Thursday morning?
Me: No, Its Sunday night. Tomorrow it will be monday morning.
L: Tomorrow? I don't know that word.

Kills me.