During the second dream, Susie wakes, screaming "I know who I am!" This is a moment viewers often point to as the moment Susie...well, knows who she is. That she knows her destiny, that she knows she's the Mother of Sighs.
The only outliers are those like Patricia and Olga (Elena Fokina), who are now decaying but still somehow alive, as well as Susie's friend Sara (Mia Goth), who discovered the plot, but was captured by the witches and is disemboweled but kept alive as part of the ceremony.