What is the ruling on the traces of semen that a wife finds the day after intercourse, subsequent to performing ghusl, and are they considered pure, allowing her to pray?

If a wife performs ghusl after intercourse, she becomes pure and is obligated to pray. If her husband's semen exits her afterward, she is not required to perform another ghusl, because it is a remnant of the first (emission), but it does nullify wudu.