How does Margaret Atwood present Serena Joy?

In The Handmaids Tale Margaret Atwood uses Serena Joy to reflect various aspects of Gilead ideology. Serena Joy is part of a collective group of women, known as the wives who are used to highlight the hierarchy that exists in Gilead and emphasize female power.
Serena Joy is introduced by Offred, she is shown maintaining and caring for her garden as if it was her child and she was the surrogate mother. This relates to her function in real life, as just like in the garden she has to be a surrogate mother if Offred or another handmaid gets pregnant and produces a healthy baby. Atwood informs the reader about how Serena Joy knits scarves for the Angels. However, Offred tells how she doubts that ‘the Angels have a need for ...