Sneha Mehra appointed DCP (South) Hyderabad, replacing P Sai Chaitanya.
Mehra, a 2018 IPS officer, is the first woman DCP.
Election Commission requested Chaitanya's transfer.
Mehra chosen from list of three IPS officers.
Mehra instructed to take charge immediately.
DCP (South) zone is communally sensitive area.
Chaitanya reportedly faced complaints over political bias.
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