In fact, I think this can be simplified further, with her parents not needing to be Sith cultists.
Well, I think the whole reason why they would get parents to raise Palpatine’s clones in the first place is to train them in the ways of the Sith. Because of that, the parents would need to be Sith cultists. Kidnapping random junk traders to raise the greatest hope of the Sith empire would be a disaster waiting to happen. 😉