^^ I agree with sandhir.candy. She had briefed it all.
Whatever Avni did like stealing and faking her identity was for good cause, and logically was the only option for her but is legally a crime.
She stole the money, but that was black money and she donated it for charity. Police knew about it, (since DD himself mentioned that it was black money) but even then the police couldn't take any action legally.(Many illegal things are done legally today, everyone knows about it but kanoon toh andha hota hai) So, Avni had stole that black money for charity. And police only focused upon stealing. *This situation somehow reflected Avni's distrust and hate towards the system cuz she know they can't do anything in such situations and took the matter in her hands.
She faked the identity cuz she knew she couldn't do anything legally. She can't approach police as Avni Ayesha since she is a murderer in eyes of law or now probably she is dead in books of law.
So her actions were logically correct, but legally wrong.