Trainer Preston M. Burch bought Gallette because of her highly successful sire, Sir Gallahad III. Because of her sire, the advertising executive William L. Brann, who co-owned a stallion called Challenger II, entered into an agreement with Burch that they would send Gallette to his stallion and then each would own her foals, first one for Brann and then one for Burch and so on. Gallette's first foal, Gallorette, went to Brann.
Two-year-old season
Brann sent the young horse to the trainer Edward A. Christmas, a member of a noted family of Maryland horsemen. Gallorette grew into a big, rangy filly. Too gawky to start too young, she didn't make her first start until late in her second year. For her two-year-old season, beginning in September, she started in 8 races and won three. She was never out of the money.
Three-year-old season
As a three-year-old in 1945, she stood 16 hands 1 inch. Her first race was a victory over Hoop Jr., the colt that went on to win that year's Kentucky Derby. She then took on the colts again in the Wood Memorial Stakes, coming in second to Jeep. "The Great Ones," a Blood-Horse book, says of her: "She was a big mare; as big as most of the colts she raced against, tougher than some of them, faster than almost all of them." Gallorette was running when races for fillies beyond the age of three were limited, and as a result, most of her important races were against male horses. In truth, there were races to run in, but being for females, they carried much smaller purses. Against females, she took the Acorn Stakes, the Pimlico Oaks, and the Delaware Oaks. Back to racing colts, she carried the same weight and competed in the Dwyer Stakes, losing by a nose to Wildlife. She won the Empire City Handicap, beating the Belmont Stakes winner, Pavot. Gallorette then lost six races in a row.
Four-year-old season
In her four-year-old season, she started out slowly before turning in improved performances. She took the Metropolitan Handicap from Sirde and First Fiddle, won the Nimba Handicap, but was then assigned very high weights. In the Brooklyn Handicap, she was up against the brilliant Stymie. Both of them followed the pace for an entire mile and made their moves at the same time, Stymie coming from a bit further back. At one point Stymie got his head in front, but Gallorette fought back and won. The rest of the year, she won or was in the money in the Bay Shore Handicap, the Beldame Stakes, the Butler Stakes, the Wilson Stakes, the Edgemere Handicap, the Sysonby Purse, and the Mass Cap. She won the Queens County Handicap when she was five in 1947.
Later years
At six, she was sold for $125,000 to Mrs. Marie A. Moore of Virginia. Gallorette won the Carter Handicap and the 1948 Whitney Stakes before she was retired. During her five years of racing—between 1944 and 1948—she won or placed in 54 of her 72 starts. She competed against future Hall of FamersArmed and Stymie, as well as U.S. Triple Crown champion Assault. Blood-Horse magazine describes the years during which Gallorette ran as one of the deepest handicap divisions ever seen in American thoroughbred racing.
Gallorette retired after the 1948 season as the all-time leading money winner among females. Although not one of the great broodmares, she did produce two stakes-winning fillies, and among her descendants are the U.S. Horses of the Year Saint Liam and Gun Runner. Gallorette died at the age of 17 at Moore's Virginia farm in 1959. In her career, she earned $445,535. Eddie "Cocky" Simms, who broke Gallorette and worked with her for her trainer Ed Christmas, told Blood-Horse, "She's not only the greatest mare, but the greatest Maryland-bred of any sex...She had a long, tough, career as a race mare, but if the jocks would have ridden her as instructed, she would have won a million instead of half a million."