This was one of the scenes I felt was most successful in all of part 4 during the first reading. It directly builds off of Day #1 - "Stakeout Date"
and immediately follows Day #11 - "Showing Up"
One of my big resolutions for every piece in the series is that each of my three leads— Mary, Mrs. Hawking, and Nathaniel — get a meaningful personal issue to deal with. It's okay and indeed expected for who takes center stage to shift, like how part 1 is mostly Mary's journey and part 3 primarily features Nathaniel's, but they all need an arc every play whether it's the story's most important arc or not.
In part 4, I was concerned that Mrs. Hawking's is so big that it might completely force out the other two. So I made particular effort to clarify what Mary and Nathaniel's journeys were in my head in very specific terms so I could focus on them. Mary in particular is all about taking steps of a journey that spans the entire series— going from ignored and agency-free nobody to a full-fledged hero in her own right. So each play is her navigating a step along that way. In Base Instruments, she decided she didn't want to be a clone of Mrs. Hawking, with nothing else but the work in her life. Now in Gilded Cages she's dealing with people prospect of what that's going to look like. She knows she wants "more," but what does "more" mean?
She struggles because before coming to Mrs. Hawking, she had no meaningful history, nothing that she did or was that mattered. She has very little to build upon, like any important relationships or ties. It's all being formed from scratch for her. This gives her a good struggle for this story, because part 4 is ALL ABOUT history. Her lack of it does just as much to shape her as Mrs. Hawking's abundance.
The other thing was, at the first reading, this particular scene was read by Charlotte as Mary and Matt as Arthur, and their performance knocked it out of the park. Matt in particular has done so much to shape the character of Arthur in my mind with his excellent portrayals, and hearing it in Arthur's actual voice with all the meaning he brought to it was such a thrill.
Also, the last line is total fan service. BUT I LOVE IT.( Day #13 - Making Room )