Julia definitely knows what's going on.
One of my favorite things that she does is answer questions.
Mama: Julia, do you want to eat crackers?
Julia: No.
Mama: banana?
Julia: No
Mama: pretzels?
Julia: no
Mama: toast
Julia then gives these slow, thoughtful nods of her head, that go way up and end up way down with her chin way down by her chest. Really gets the point across.