Kirti doesn’t have the luxury to pause and think. From the start we have seen her going day to day, trying to sort one problem after another, trying to keep her head above water. I’m remembering that confusion in the beginning, Prasanna inviting her which she declines, Tejas then tricking her to come over, but both of them failing to see how her life is so packed. I wonder if she has a sort of PTSD, from the eloping mother, to the death of her father.
Her father young death or mother leaving must have an impact on her. Maybe PTSD like you said. Her personality must be affected.
But her intial proposal to Mayank and their engagement was reactionary...she wanted peace from her grandmother marriage nag. Self focussed and did not think about Shruti or Mayank. So to me it is her personality..she makes decisions based what she thinks right (true she thinks it will not hurt others) and like Kavi pointed out does draw her own conclusions
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