Can Secret Oath join the short list of Preakness winners who were fillies?

Only six fillies have won the first 146 editions of the Preakness Stakes. The Kentucky Derby winner will not be running in the race on Saturday. Flocarline was the the very first to win the event in 1903. Whimsical, Rhine Maiden, Nellie Morse and Rachel Alexandra have also won it. Rachel was Horse of The Year in 2009. She won 13 of 19 starts for earnings of $3.5 million. She was sold to billionaire Jess Jackson. In 1924, she won Kentucky Oaks. It was only the second time in history that more than one of Triple Crown races was won by a filly.