Malini is obsessed with Aditya. Her whole life revolves around him. She will not ever even try to be happy without him. I'd like to see how her first interaction with Imlie will be on her arrival to T house. Deceptively sweet or honest and apprehensive. After actually having suspicious thoughts in her head about Adi and Imli - can Imli ever even come back to T house and how can Malini be comfortable with this? It will be interesting to see how they pull off Imli's return and if Malini even has a say in it.
And that obsession is what she needs to rid herself of. What she does to get there is going to be her arc. Unless they want her to go mad by the end of it all.
I do not think Aditya will care about anyone’s feelings when he wants to bring Imlie back. This man undergoing realization is vastly different to the one they knew of in the T house. So I doubt Malini will have a say. I do not think there is going to be a flip back in Aditya’s character anymore either. Malini might turn grey for a bit. She has never liked Imlie taking away the focus, be it with the family or especially so with Aditya. But she will obviously turn up the charm in any case.