The 31-year-old had been a professional rider up to four-star level, but had to give up eventing because of her injuries, even though she had undergone “successful” spinal surgery on a fractured vertebra.
In a Facebook post announcing her death on Saturday, the rider said she had thrived on “adrenaline hits” and spontaneity, but could no longer do the things she loved.
She said: “Assisted suicide is always something that I believed in and have always said that if anything happened to me and I was forced into the predicament that I couldn’t have the quality of life that I wanted, that would be the route I’d take.
“Not going to lie, never imagined it would come to fruition, but here we are. No one can truly understand what I have to go through.”
March said she had always wanted a family of her own and would have given up “everything in an instant” to have one.
She added: “My utmost respect for anyone who hasn’t only made a life after injury, but those that have flourished.”