Fellow camper Geoff Brookes from Kidderminster, said the family had taken a barbecue stove into one of the tents because it was cold.
We heard they had taken a barbecue stove into the tent. Carbon monoxide is a silent killer. There was nothing they could do for the girl.
The scene remains cordoned off tonight.
An investigation is continuing today into a campsite tragedy which left a teenage girl dead.
A girl has died from suspected carbon monoxide poisoning and 3 others are in hospital.