Why not... let me go ahead and predict..
I know we think CVs are whitewashing ishwari.. but may be they are not... instead i feel they are just building up for the next track. The purpose of this track is to push Dev in a guilt trap. When ishwari finally returns, gkb will tell her what all has been going on and she will be insecure once again. She may also see that dev and sona are acting more like friends and the hatred is gone. Since there is a lot of mentioning about sona in bose house - ronita saurav and mandols. There will be another 7 day stint in bose house. Asha saying that may be sona might not return from dixit house etc is probably just a googly for us. So the 7 days may begin almost immediately after ishwari returns. Dev will probably say sorry to ishwari for not being there for her when khatri was mentally torturing her etc. ishwari along with vicky and gkb will plan to use this opportunity- dev's weakness and make him promise that he will agree to what ever isjwari asks etc. he will promise and she will ask him to sign custody papers for suhana.
So ishwari will send the papers to sona .. ofcourse she is unaware that dev already gave away all the rights. So in this case dev may actually standup for the right thing and make sure suhana is not separated from sona. He doesnt want to fail his daughter because of his moms unending wishes. He will work with sona and ensure ishwari loses. Sona may finally start to trust dev and may be the one to propose this time ofcourse with a cauliflower...
I hope they take it this route... lets see