The Question and Answer section for The Handmaid’s Tale is a great resource to ask questions, find answers, and discuss the novel.
In Chapter 28, Offred and Moira's relationship is denitiely not at a high point. Moira's disapproval of Offred and Luke's relationship creates tension.
In this excerpt, the mood is one of confusion and disbelief.
Before "the fall", Serena was a famous gospel singer.