Police have scaled back a search for 53-year-old Judith Williams, who went missing from a camp site at Border Ranges National Park near Wiangaree in the early hours of Saturday morning.
Ms Williams, pictured, was staying with her husband in a caravan on the site and has not been seen since 3am Saturday, when she left to visit the toilet block.
An air and land search of the area has failed to locate her and police say they are now relying on information from the public to find her.
Mrs Williams is described as being of Caucasian appearance, between 140 and 150cm tall, with a solid build, and greying brown hair.
She was last seen wearing long white pants, a cardigan, believed to be blue in colour, and a pair of boots.
Mrs Williams suffers from early stage dementia and epilepsy and her family have told police she walks with a distinct shuffling action.
Police are urging any member of the public who may have any information to contact Lismore Police or Crime Stoppers on 1800 333 000.