Nottinghamshire Police are concerned for her safety after she was reported missing from the Cotgrave area at 11.30am on Friday 6 July 2018.
Gretta is described as white, shoulder length straight hair down to shoulders, 5ft 4ins tall, wearing a patterned cream shirt, oriental patterned dark trousers and had a black handbag with a strap.
If you have seen her or have any information please contact Nottinghamshire Police on 101 quoting incident number 668 of 6 July 2018.