What happens to the right to the deferred dower if a master delegates the dower for his female slave, then emancipates or sells her, and a dower is subsequently stipulated?

Primary text

If a man delegates the dower for his female slave, and subsequently emancipates or sells her, and then a dower is stipulated for her, the right to that dower belongs to her emancipator or seller because the dower became obligatory upon the contract while she was under his ownership.