How does the woman in the holding cell suggest that she may be related to Winston?

Winston thinks that the drunk woman could be the right age, height, and build to be his mother. There is a disconnect between Winston and his family, especially his mother. Winston always feels the heavy burden of guilt over how nasty a boy he used to be. He wonders what happened to her. The drunk prole in the cell serves as a disconnect between the mother he knew and the woman she might have been.