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She left the NIP form at her mother's house because she knew she was in Parliament that day and couldn't have been driving.
Then her 'lovable rogue' of a brother, who she's very angry with, told lies on the form.
She didn't realise she had to fill the form in herself because she was busy, and racists. And wouldn't you know it, Parliament was shut that day, of all days.
She had several interviews with the police where she might have explained all this but hadn't thought of it then.