Ramdevi was resident of Rajnagar Extension under Sihani Gate police station.
She complained of fever yesterday morning and when her condition deteriorated, Ramdevi was admitted to Kailash Hospital where she died late in the night, Investigating Officer Praveen Kumar Sharma said.
Doctors at the hospital told police she couldn't have died due to fever, Kumar said.
Police have seized the body and sent it for post-mortem to ascertain the cause of her death, he added.