A police cordon around the Bounce About play area where the young girl died. Photo / BBC
Ava-May was placed on the trampoline by an attendant, with Abbie claiming she was near enough to grab her if she fell off.
Abbie then heard a loud bang like "someone had set off a cannon".
She said: "It was the loudest bang I had ever heard. The bang came from the trampoline.
"It looked like it had burst. It looked as if it was the blue bit which was tight and bulging. I saw a hole where the bulge had been.
"Ava took the full force of it. In a second, I looked up and saw Ava in the air. She was just flipping. When I first looked, I saw her face.
"Her eyes were closed and she didn't scream or make a noise. I think the impact had forced her up and knocked her out. It looked like she was asleep."
A female member of staff tried to catch the girl before she landed on the sand.
Family friend Beth, who is a nurse, tried to resuscitate her.
Abbie ran over to her family screaming "Ava's gone, Ava's gone."
Ava-May Littleboy, who later died in hospital. Photo / Just Giving
Beth said in a statement: "She went up so high, it was higher than my house, about 20ft. There was a massive thud and Ava came down on her face and tummy."