Ella Tromp has been charged with stealing a car, a day after expressing relief her missing father Mark Tromp was found alive in Wangaratta.

Victoria Police has confirmed a 22-year-old Silvan woman was charged with theft of a motor vehicle and possessing the proceeds of crime.

It is alleged Ella Tromp stole a car in Goulburn, New South Wales, and drove it back to Victoria after she split from her parents during a road trip.

The mystery surrounding the family of five ended at the weekend when Mark Tromp was found running along a street in Wangaratta.

There has been little explanation about why the family left their Silvan red currant farm on Monday, but Mitchell Tromp said his parents were scared and thought they were being followed.

On Sunday, Ella and Mitchell Tromp said the road trip and subsequent separation of the family was "a family matter".

Ella Tromp returned to the family farm two days after the whole family of five left for New South Wales and then split up.

She told police she left her parents along with her elder sister Riana Tromp, 29, at a service station outside Goulburn on Tuesday.

The sisters were later separated and Ella Tromp returned home alone.

Riana Tromp and her mother Coby Tromp remain in hospital where they are being treated by health professionals.

Ella Tromp has been bailed and will face the Ringwood Magistrates Court in April.