On Wednesday, Kilwinning Academy paid tribute to Sophia, saying she was “known for her bright smile, vibrant personality and helpful nature”.
North Ayrshire Council described her as a popular and well-liked member of the school community, and said support would be available to staff and pupils at the school.
Sgt Stewart Taylor said the force was continuing to seek witnesses with information about the incident.
He said: “Our thoughts first and foremost are with Sophia’s family and friends, and everyone affected by this crash.
“We know there were a lot of people out in the area at the time of this crash, and I’d like to thank those witnesses who have come forward in support of our inquiries, along with those who assisted at the scene.
“This incident will be felt by the local community and our investigation continues to establish what happened.”
Anyone with any information should contact Police Scotland, external.