Nadya does remain with the clan, ultimately, and since then, I have interesting thoughts about her relationship with Elizabeth.  I think at one point, early on, there was potential for Nadya to be like a daughter to ELizabeth.  I think when Rowland brought Nadya back, Elizabeth had that in the back of her mind, that she wanted a daughter and she could find one in Nadya.  However, after the incident, most hope of that kind of dissolved away.  
It's interesting though, because as things stand by the time Elizabeth and Jaspin meet again, Nadya is the person she spends the most time with.  Jonathan lives in a city not far away with Eleanora, and Rowland and Bela have manly things to do, so Elizabeth and Nadya are the ones taking care of the home together.  So there's gotta be something cordial and cooperative about their relationship in some way.  But Elizabeth doesn't see her as any sort of equal.