Em may have a future career as a politician, as she is getting very good at evading the question when she doesn't know (or doesn't want to give) the answer. A case in point:
Me: Can you remember how old you are Ember?
Em: I'm turning in August.
Me: Yes that's right, your birthday's in August. Can you remember how old you are now?
Em: I'm a big girl!
Me: Yes, you are. But can you remember how old you are?
Em: (pause) I'm... (pause, hoping I might fill in the gap) six?
Me: Not yet! You're two.
Em: Yes, I'm two. I'm two Jo. Charlie, I'm two. I'm two Jon. I'm two.