What is the “infinitely delicate balance” that the author refers to in paragraph 66?
The stolen party.

The infinitely delicate balance at that moment is the balance between Rosaura's persona at the party and the fact that she's the daughter of the housekeeper. When Señora Ines holds out the money to Rosaura, she's reminding her that she isn't like the other children; she's the child of a servant.

you need to add more so i can you

with whom will you be coming to the party? this is written correctly.