I have no idea if you found anything or not? But, here is what I found.
Belle Starr, Outlaw & Horse Thief, born: Carthage, Missouri, Feb. 5, 1848, d. Feb. 3, 1889 near Eufaula, Oklahome. Born: Myra Belle Shirley, married Cherokee~ Sam Starr~ AKA~ Blue Duck (outlaw- ex gang mem., of Jesse James). Belle was an old neighbor & friend of Jesse James.