| Quote #1
The waiting room was full
Here Elizabeth makes a distinction between herself and the other people in the waiting room. They're "grown-ups"; she's definitely not one of them.
| Quote #2
and while I waited I read
Elizabeth sounds like a smarty-pants here. She's not even seven years old and she can already read a magazine for adults. She seems pretty proud of this.
| Quote #3
I said to myself: three days
She reminds herself of her age here as if to calm her crazy thoughts. It's like she's saying, I'm too young for such big ideas!