Investigations into the death of a soldier could take up to 18 months or more to complete.
Lance Bombardier Ciara Sullivan, who served with the King’s Troop Royal Horse Artillery, died at the scene after falling from her horse during the Royal Windsor Horse Show on May 15.
An inquest into the 24-year-old’s death was opened on Wednesday.
Coroner Hannah Godfrey said investigations by the Health and Safety Executive (HSE) and the Defence Safety Authority (DSA) are still underway.
Ms Godfrey said: "This was a death in the workplace.
"I would like to have the opportunity to consider the findings of these investigations before holding an inquest."
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The DSA and HSE inquiries are expected to take 12 to 18 months or more.
A full inquest date has not yet been set.
A spokesperson for the HSE said: "We can confirm the Health and Safety Executive is leading the investigation into this incident and we are making inquiries."
At the time of the incident, members of the royal family were present at the arena.
A spokesman for Buckingham Palace said King Charles was "greatly shocked and saddened" by the news.
L/Bdr Sullivan took part in the late Queen’s state funeral in 2022 and the coronation of Charles and Camilla in 2023.
She joined the Army Training Centre in Pirbright in November 2020 before entering the King’s Troop in June 2021.
A provisional cause of death was given as chest injuries but remains subject to review.
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