What happened to Winston's mother?

Winston's mother is mentioned in George Orwell's "1984" as having disappeared during the political purges of the Party. He recalls her as a loving figure who sacrificed herself for him and his sister, and he believes she may have been arrested or executed by the authorities. Her fate symbolizes the personal losses and betrayals caused by the oppressive regime. Ultimately, her disappearance contributes to Winston's feelings of guilt and regret over the past.