Neetu knows Bobby deserves punishment, that was her first reaction. But her fear of losing Vikrant is overpowering her mind. And she have history of suicide attempt, assuming after the death of real Vikrant, her mental health is not the best. She is possesive of Vikrant not wanting to lose him again.
She blames Mannat because Bobby is in jail because of Mannat's recording. If Mannat had not pursued justice, Bobby would have been free and by default no fear of Aman truth being revealed.
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