NSW five-year-old dies in Thailand crash

The northern NSW family of a five-year-old girl killed in a motorcycle accident in Thailand have launched an online campaign to bring her body home.

Sonya Davis from Byron Bay died in a Thai hospital on Friday, four days after a car hit the motorcycle on which she was travelling with her grandmother in northern Thailand.

The little girl's Thai grandmother was killed instantly in the January 18 accident, and Sonya was left on life support in hospital.

Sonya was in Thailand with her parents, George and Somepong Davis, and her six-year-old brother Justin, visiting Mrs Davis's family.

The "Bring our Sonya Home" campaign has been launched.

"After five harrowing days for her family, Sonya lost her struggle for life and passed away in the early hours of 22 January 2016. Her mother, father and older brother, Justin are utterly devastated," the site says.

"Somepong's grief is doubled having lost both her mother and daughter in this tragic accident."

A Department of Foreign Affairs and Trade spokeswoman told AAP on Tuesday the family has been offered consular assistance.