It's been revealed a driver in a Queenstown crash that killed a teenage girl - was sending Facebook messages while travelling at up to 112 kilometres an hour

Tully Robinson - sister of Kiwi Ski Champ Alice Robinson - is charged with careless driving causing death and aggravated careless driving causing injuries in relation to the death.

Teen passenger Allanah Walker died when Robinson crossed the centre line and collided with her car.

The 22-year-old returned from being overseas with her sister in Europe, and in Sydney, to plead guilty to the charges.

Today at Queenstown District Court - Police revealed they found Facebook messages sent while Robinson was driving - and an unsent message open at the time of impact

She was also over the legal alcohol limit.