She was the secret morganatic spouse of Prince Charles Philip, Duke of Södermanland.
The wedding contract was signed: "Your faithfull husband, as long as I live, Carolus Philippus", and: "Your Royal Highness humble servant as long as I live, Elizabeth Ribbing".
Because the marriage was kept secret, Ribbing was forced to defy her brother's wish that she marry her relative, Knut Liliehöök (1603–1664).
She was pregnant at the death of her spouse, and was harassed by her family because of it until her sister, her wedding witness, revealed the marriage.
Her daughter, Elisabet Carlsdotter Gyllenhielm (1622–1682), was taken into the household of the Queen Dowager: she was married to the nobles Axel Turesson Natt och Dag (1645) and Baltasar Marskalk and lady-in-waiting to Queens Maria Eleonora of Brandenburg and Hedwig Eleonora of Holstein-Gottorp.