13-year-old Hannah Jessica Wiley died after her pony fell on her at Eglinton Equestrian Centre in August 2012.
The coroner said a horrific combination of circumstances led to Hannah Jessica Wileys death.
He added that it was a distressing case and one her parents would have to live with for years to come.
The coroner told the inquest that it appeared that Ms Wiley was riding her horse without any problems towards a fence when a pole became trapped between the pony's legs.
The pole caused the animal to fall on top of her.
He said it was not the function of the inquest to establish liability, but that the horse riding organisation was well-run and the equipment used had been in operation for years.