Up From the Ashes
Keturah was a captive of the Dune Folk for almost a full year, and in that time was impregnated not once, but twice. The first time it was a girl, who was immediately taken and traded to a passing caravan in exchange for necessities and more useful slaves. Keturah was told the baby had been eaten. But the baby survived, and was eventually sold by that caravan to slavers in Chiaroscuro.
The child was beautiful and well-behaved, so she was raised to be a courtesan, and lived in a very expensive brothel called Silk Garden until Daven and Naal arrived to free her. Currently staying with Keturah.