The 17-year-old said she received a call from her 18-year-old former friend earlier in the day, asking her to meet so that the pair could discuss their recent falling out.

“We had some unresolved issues that she said she wanted to sort out,” Miss Hopkins-Windle said.

“I was fine to meet her, and I told her, ‘as long as you’re alone, that’s fine’.”

At 4:15 in the afternoon, the two young women drove to Bolton Park to meet the 18-year-old’s boyfriend.

Miss Hopkins-Windle alleges another group was waiting there.

“They dragged me out of the car by my hair and one of them hit me really hard in the back of the head. That’s all I remember.”

When Miss Hopkins-Windle regained consciousness, she was surrounded by caring strangers.

“The man told me not to get up, and just to stay calm because there was a lot of blood.

“They got me blankets and elevated my head and told me the ambulance was on its way.”

She was taken to the hospital for CT scans and x-rays, which revealed no significant long-term damage.

“The ambo said if I was hit any harder I might not be here now, and that’s a really scary thought,” Miss Hopkins-Windle said.

“I did spew up blood the next day, so I went back to the hospital and they said that’s natural but I should come back if it continues because it could be internal bleeding.”

Now, Miss Hopkins-Windle is appealing to witnesses to help her determine who attacked her.

“I don’t know who the girl is who hit me, but I think it was filmed because one of them had her phone out with the flash on when it started.

“There were kids at the park, my little brothers often go to that skate park on Thursdays when our step-mum is out shopping.

“I never would have forgiven myself if they were there. No-one needs to see that, especially not kids.”