Molech wrote:
A problem (perhaps) with Shaktari: She was not born a Marilith but a human. If you're gonna make her another Marilith's mother you may want to consider how/why.
This isn't true. You're confusing Shaktari with Kaliva. The primary antagonist in the adventure "Vudra," where Shaktari was first introduced, is Kaliva, one of Shaktari's minions. Kaliva was formerly human; she was transformed into a rutterkin as a curse and earned her way to marilith status from there.
Shaktari herself does not play a role in the adventure except as background text. She is only briefly described and her origins are not given. Nowhere is she said to be formerly human.