What happened to the slave girls of the prophet?

According to the following hadith: > 'Amr ibn al-Harith, the brother of the Umm al-Mu'minin, Juwayriyya bint al-Harith, said, "When the Messenger of Allah, may Allah bless him and grant him peace, died, he left neither dirham nor dinar nor slave nor slavegirl nor anything other than his white mule which he used to ride, his weapons, and some land that he made sadaqa for travellers." > > Riyadh-as-Saliheen by Imam Al-Nawawi, volume 3, hadith number 475 What happened to the slave girls of the prophet? Were they freed or sold or did they die?