SNAP 2017 Games & Tournaments — Previous Year Question

Four women P, Q, R, S and three men X, Y, Z play bridge, a card game for four players. The men and women consist of three married couples and a widow. The members of each married couple are never partners in a game. No more than one married couple ever plays in the same bridge game. One night they played four bridge games in which partners were as follows: Game 1: P and X versus Q and Y Game 2: P and Z versus S and Y Game 3: Q and R versus Y and Z Game 4: R and X versus S and Z Who is the widow?