Anna's in the waiting room, talking to to the seven-year-old and her mother, and as Elsa walks out she's reminded of her own staring match with the little girl.
Back when the therapist had wanted to speak to Anna, about something she hasn't yet shared.
The knowledge sinks her heart, just a little, but she understands. Anna doesn't have to say anything – it's not like Elsa discusses her sessions, either.
But, she is curious. Anna... Anna's an open book, but some of the pages are missing. Elsa just has to find them.