The person that Lewis is addressing in this scene is Lorina Liddell Skene, the older sister of Alice Liddell. This intermission takes place in June 1876. Ina married in 1874.

The intermissions were planned from the very beginning of the series and were originally meant to separate the main arcs. Since then, the decision was made to have the arcs cross into different books (originally we wanted to do one arc per book), we decided to have the intermissions at the beginning of each physical book.

The prologue and intermissions tell the story of Alice Liddell and Charles Dodgson and their contemporaries, and it's my hope that at the very end of Namesake that we can compile these into its own book in addition to their place in the regular books. While these intermissions seem unrelated Emma's story, believe me, they are very important to the main plot.