She had food, a tent, wet-weather gear and a torch.
"We don't know if it's a problem until daylight. Search and rescue will be mobilised at daylight but given her preparation and resources we're not too concerned at this stage," he said.
There is an alert on the Edwards-Hawdon route after heavy rain significantly damaged the track and structures.
The route is described as a three-day tramp over two alpine passes and spectacular rock-fall. Rivers are not bridged.
It is only recommended for people with a high level of remote-area experience, navigation and survival skills as complete self-sufficiency is required.