Women's liberation was one of Sue's most prominent areas of activism. She explored and brought awareness to many facets of feminism such as body positivity, sexuality, motherhood, sexist pay gaps, workplace discrimination, and violence against women. She participated in and photographed the "Take Back the Night" march in April 2002 where women spoke out against rape and domestic violence.
One interesting aspect of the feminist movement that can be seen in this collection was the separatism that could be experienced between mothers and non-mothers. Some feminists held deep resentment towards men and that included male children. In one letter, Sue was referred to as a "mother of a son" and was excluded from a feminist camp group simply because of her being mother to a son.