She inherited Calumet Farm on the death of her husband and ran it successfully for more than thirty years.
In 1978, when Calumet Farm's outstanding three year old colt Alydar (named for Prince Aly Khan, and half-brother of Our Mims), ran in the Bluegrass States at Keeneland the Markeys (due to their failing health) were brought to the rail to watch him run.