She only wants Soha to come and live permanently in dixit house as Suhana Dixit., as Dev Dixits 's daughter and Ishwari Dixits grand daughter.. Once she succeeds she will cut all ties between Suhana and Boses. Until that happens she wants to be in good books of bose family.
She is going to file a custody case onbehalf of Dev - this is going to cause Sona to retreat and be protective of soha. Even though it is not Dev's fault - he is responsible for all things that happen from Dixit family side . He will have to stand up and confront Ishwari this time. I dont think the case will go to court but the prenup and contract copies will be sent to both Dev and Ishwari.
What happens after that - sona will agree for Dev to come and live with them in Bose house or in a separate house but will not go to Dixit house. Dev needs to go through some major rehab... then they will probably fall for each other again ... then marry and move to dixit house eventually... then take each dixit member to task.
I really hope Sonakshi learns some manipulation from Beyhadh's Maya ... to survive in Dixit house.