Horse racing has been suspended for the day, as an outbreak of equine influenza has been diagnosed in a number of horses.
The BHA had put trainers on alert over the contagious disease after several outbreaks in northern Europe and sent out a letter to trainers recently.
All racing has been cancelled in the United Kingdom on Thursday after one stable returned three confirmed Equine Influenza positives from vaccinated horses.
Speaking to BBC Scotland, she added: "I'm disappointed for the people who were coming to see these wonderful horses and who might not get a chance to see them at Cheltenham or just on TV".
Horses from the infected yard raced on Wednesday, potentially exposing a significant number of horses.
Meanwhile, Donald McCain has confirmed that the three cases previously detailed came from his yard in Cheshire.
Equine influenza, or equine flu, is a strain of flu that effects horses.
The British Horseracing Authority (BHA) said in a statement there was significant concern over the disease spreading.
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Equine influenza causes similar symptoms in horses to those suffered by humans; including fever, nasal discharge and a harsh, dry cough.
As an interim precaution, the IHRB and HRI have decided that runners from Britain will not be permitted to run in Ireland in an effort to reduce the risk of further spread of the disease via horse movement.Horses will continue to be able to race across the north/south of the island of Ireland.
A decision on whether racing can resume next Wednesday will be made by the BHA on Monday.
In 2001, an outbreak of foot-and-mouth disease wiped out racing for two months in Britain, leading to the cancellation of the Cheltenham Festival, which is held every March. "This may then allow declarations to take place on Tuesday in time for racing on Wednesday".
McCain said: "We are scrupulous about observing the health status of horses in our care and taking the necessary steps to treat any condition that may affect them".
"When new horses arrive at our yard we try as much as possible to keep them separate, but at this stage can not know if the infection came from recent arrivals or from horses returning from racing".
"The situation here is not the same", the BHA said, adding Australian thoroughbreds aren't vaccinated against horse flu, while British horses are because the virus is endemic in the UK.