Two off-duty nurses and an off-duty doctor began performing CPR on the beach before the teenager was taken to Alder Hey Children’s Hospital by air ambulance.
She died from her injuries four days later.
Wheeler commended the bystanders who had tried to help Chiedza, but was scathing of drivers who had parked illegally on the narrow roads near the beach.
She said: “I record my condemnation of selfish drivers who park illegally simply for the sake of having to avoid walking a short distance.”
However, Wheeler did not write a Prevention of Future Deaths report, a legal document coroners have the right to send to organisations or individuals if they believe action must be taken to prevent loss of life.
She said this was because Sefton Council had already put yellow lines on the road leading to the beach and she did not know who she could write to who was in a position to take action.
Wheeler offered her condolences to Chiedza’s family, who were not in court.
She said: “Her death is an utter tragedy and I am deeply sorry for her family, her friends and all those who knew her.
“I am so, so sorry for your loss. I can’t imagine what you are going through.”