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Tromp daughter was found in back of ute

AAP logoAAP 1/09/2016 Kaitlyn Offer and Helen Velissaris

A Victorian woman who ran away from an ill-fated family road trip was reportedly found "catatonic" in the back of a man's ute in regional NSW.

Riana Tromp, 29, is in Goulburn Hospital after being found in the back of Keith Whittaker's Ford F250 at Lake George on Tuesday, according to the Goulburn Post.

Mr Whittaker told the paper he had filled his car with fuel at a Goulburn service station about 11am on Tuesday and then began driving to Canberra for a doctor's appointment.

When he got to Lake George, he felt a kick on the back of his seat, turned, and found Riana laying on the floor, so he pulled over.

He said after about 20 minutes, the young woman sat up and stared straight ahead.

"I asked her who she was and if she was all right? She did not know her name and had no idea where she was," Mr Whittaker said.

"I asked her if she needed any water or anything or was in any way injured and she said no.

"Then I called the police. Until the police arrived, she mostly sat and stared straight ahead as if she was catatonic."

Mr Whittaker said Riana was well-dressed and offered $50 for his trouble, which he declined.

AAP has attempted to contact Mr Whittaker.

Riana has since been reunited with her mother, who was transferred from Yass Hospital to Goulburn on Friday.

Jacoba Tromp, 53, was found at Yass Hospital on Thursday, two days after being reported missing from the Jenolan Caves with her husband Mark, who is still missing.

Police on Thursday said Mrs Tromp's mental health and wellbeing was "not at a good standard".

There have been numerous unconfirmed sightings of Mr Tromp circulating around the media.

Police would not confirm to AAP if they were investigating any sightings in NSW.

The last confirmed sighting of Mr Tromp was him running from the family's grey Peugeot and into a park in the Victorian town of Wangaratta on Wednesday night.

Owners at Miller Cottage Motel in the area said they found a room's door ajar on Friday morning.

Police are dusting the room for prints, News Corp reports.

Stress over everyday life, family and financial issues led the Tromps to abandon their home, phones and credit cards on Monday and drive away, police say.

Two more adult children, Mitchell and Ella, have returned to Melbourne.

Readers seeking support and information about depression can contact the Depression Helpline (from 8am to midnight) on 0800 111 757.

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