NSW woman missing for six days

The search for an elderly woman missing in the NSW Blue Mountains is entering its sixth day.

Elizabeth O'Pray, 77, left her Medlow Bath home on Monday and hasn't been seen since.

Searchers spoke to her on her mobile on Tuesday night and she is believed to have told them she was OK but lost.

On Friday night a local resident reported hearing a call for help from the valley below Peckman's Plateau but a search party and helicopter found nothing.

Mrs O'Pray is known to walk along Grand Canyon Road in Medlow Bath and a small track towards Katoomba.