Naira does make mistakes, just that she doesn't sit and cry over them forever, instead she tries to set things right.
She misunderstood Akshara, when she realized she was wrong, she set up a day to spend with Akshara to catch up of thing.
When she realized she was wrong in blaming Karthik In Naitik kidnapping, she apologized continuously.
When she got a slight hint that Karthik may not be involved in Akshara's accident, she worked to prove his innocence.
When the invitation card got burnt, her and Karthik together made the e cards.
It isn't that she doesn't make mistakes, that is why she is the lead. It is the fact that she makes mistakes and corrects them, then just sitting down and crying.
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