Juliet thanks Sidney for the red satin tap shoes he sent for Kit. She explains that Kit will stay with her for a while, as Amelia is tired after the trip to France and Remy might yet come to stay with her. Kit knows that Elizabeth is dead, and Juliet has been careful to not press or treat her differently. Juliet remembers how Reverend Simpless's wife made her cakes when her parents died, and it was awful to have to eat them.
Because of Juliet's own experiences losing her parents, she's better able to care for Kit during this time and not force her to act a certain way. This shows that Juliet respects Kit as an individual, and believes that Kit should do and say what she needs to do to feel okay.
Juliet says that she's having trouble with her book. She has data and interviews, but can't figure out a structure. She asks if she can send him her pages so he can look at them. Juliet also includes a postscript, thanking Sidney for the clipping of Mark dancing with another woman. She says he failed to send her into a jealous rage, that both he and Mark want her to be unhappy, and suggests they form a club.
It's worth noting that Juliet's ability to not feel jealous about the photograph is an indicator that she's not particularly torn up about Mark; she understands that not marrying him is what will allow her to continue writing and allow Sidney to continue editing her work.