But to get her logic we need to analyze things in her view point were she going what she wants
Let me explain here pardon me pls
As we see all tv heroines are mahaan atma who can tolerate odds and zoya from the start is not exceptional.
True to her character her character stays on .
First she blindly trusted yash ppl around her kept on saying yash cheated but she didn't until a strong proof like divorce reached her senses .
She went to extreme of suicide but Adi words brought her back to fight for her life .
After that her journey was full of twists and turn with the case she got heartbroken because yash was made prime culprit.
She knows only white peace and purity she always saw good in ppl
In mahi she expected goodness in Adi she brought out good things in him stopping him from doing bad and now she is gona see goodness in poosh .
Few ppl are like that I have seen ppl like that in my life .
So by proving poosh were in love there love was pure etc which may look foolishness to all of us but for her she is seeing the other side of the coin .
She wants to explore were she was wrong that yash went elsewhere.
Mind it she said she won't forgive yash for EMA.
Her main motive is to cremate his memories with respect not keep some hidden truth or lies were she has to feel guilty through out her life .
Bottom line is she wants a closure never want to have nothing left from the past to feel guilty or sad or frustrated about things should must be like that or I should have done this .etc...
She feels she needs to do her duty as a human being
As a wife yash failed her but as a human being she should not fail .
She wants to end the chapter to get closure
To let go yash forever she is firm in proving yash was in love with pooja and not dippressed to kill pooja who was Adi's wife.
New twist of poosh crossing there limits and zoya is not bothered pooja was pregnant with yash might look weird but for her it's just one more page in betrayal book .
Zoya logic is weird but she is going in right path .