Her responsibility was to ensure a "systematic and timely examination" of the bank's financial transactions, he said.
Kirdat audited the bank's transactions monthly, but allegedly could not or did not point out irregularities in its processes.
She was called for questioning and later arrested, the official said, adding that she was remanded in EOW custody by a local court till November 18.
Earlier, the EOW had arrested three top bank officials and two promoters of HDIL -- Rakesh and Sarang Wadhawan -- in the scam.
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