[1] She was sired by Sir Dixon, the 1888 Belmont Stakes winner, and out of the mare Bonnie Blue.

Blue Girl was sold as a 2-year-old in 1901 to John E. Madden, the owner of Hamburg Place stud farm at Lexington, Kentucky.

[1] Blue Girl was trained by John Madden as a two-year-old and won the Juvenile Stakes, Eclipse, Great Trial, and Great American Stakes for Madden, netting $38,230 in purse money.

She was bought by William Collins Whitney in late 1901 who turned her over to future U.S. Hall of Fame trainer John Rogers for whom she won the Great Filly Stakes earning $23,975.

[4] Blue Girl was sent to Britain in 1912, but returned to the United States in 1915[5] due to anti-American Thoroughbred sentiment and the passage of the Jersey Act.