I think this is what is gonna happen.. let me know what you think..
Sonia.. as you all saw, wants revenge on Dev for how he treated her. So i think she will find out everything about him.. and find out about Kaajjal eventually.. but she will work towards keeping Kaajjal and Dev apart because she hates Dev and wants him to suffer.. i think Dev will do more obnoxious things to her
Also, i think Sonia will see that Kaajjal makes her brother Aditiya happy, and she want her bro to be happy and wants Kaajjal to be away from Dev & her bro is happy with Kajjal.
Another thought, i think Dhruv may be back as a potential pairing with Sonia.. cuz she was saying something about her marriage with a business man.. i know Dev falls under than category but i don't wanna think Sonia will go for him.. hehe😆