P.S. Malini has totally sensed that there is something between Adi and Imlie now....but she lacks the guts to confront either of them directly. That is why she is freaking out over things like seeing sindoor on Imlie....there is no reason to panic over it otherwise....why take sindoor on Imlie as some personal affront to yourself unless you think that sindoor is connected to your husband somehow?
So Malini is noticing everything but doesn't have the courage to admit it to herself yet....so she is just coating it all in a generic, "I'm fighting for my marriage and my husband" funda.....all of this will come out in some outburst at some point but all that Malini is doing right now can no longer be filed under generic jealousy.....she is consumed with complete jealousy of Imlie because of all the attention/importance Imlie is getting from the family as well as Adi.....Malini is not being able to bear it one bit.
I feel more than the jealousy it is ignorance and indifference of Aditya is hurting Malini.
Having said that I really liked the way you have analyzed her character