Members of the Bit On The Side saddle team enjoy an early morning hot tub session before their display at the Blenheim Palace International Horse Trials earlier this month
Eyewitnesses claim she administered drugs, including giving one member of the public an injection.
In the days after the event, Blenheim Palace chief medical officer Sue Smith alerted police.
Grant has now been charged with one count of fraud by false representation and one count of assault occasioning actual bodily harm.
Today she appeared at Oxford Magistrates' Court, where her case was transferred to Oxford Crown Court next month.
Event organisers said in a statement: "The safety of everyone who attends Blenheim Palace International Horse Trials is our highest priority.
"We are investigating what access this person might have had to people who came into our first aid facilities."As soon as we were made aware that someone had been trying to impersonate a medical professional we referred this to the police and we are therefore not able to comment further."
A Thames Valley Police spokesman said: "The charge of fraud by false representation is in connection with an allegation that Grant falsely claimed to be a medical professional at Blenheim Horse Trials earlier this month.
"The assault is in relation to an allegation that Grant gave a patient an intravenous injection of an anti-sickness drug at the horse trials."
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