After the start of Operation Winter's End, Edward Winter sent an encrypted holotape to Pozinkski discussing dinner plans – reservations at the Cornerstone Grille. This holotape doubled as evidence against Arthur Black, a known associate of Mr. Winter. Winter would later send her another holotape, using a discussion about vacation to Ireland – specifically mentioning Dublin, Galway Bay, Waterford, and a little bed and breakfast in Kilkenny they used before – to incriminate his cousin Steven.
After the end of the operation, he sent one final holotape to her, discussing the end of civilization, his new condition, and how they could ride out the coming nuclear holocaust together in his shelter.
Claire Pozinski is mentioned only in Fallout 4.