On March 9, 1865 at Washington, D.C., The Evening Star newspaper reported the following: “MISS BLANCHO BOOTH; EDWIN; J. WILKES BOOTH; ST. LOUIS” “We learn that Blancho Booth, a niece of Edwin and J. Wilkes Booth, will shortly make her debut in St. Louis. She is a dashing beauty, and will make a sensation in comedy. A magnificent wardrobe has been made for her at the expense of her uncle, Ben De Bar, the St. Louis manager.” (The compiler notes her correct spelling was Blanche De Bar Booth and has a Find A Grave Memorial # 38775484)
In 1925 Blanche made a startling confession by stating John Wilkes Booth had escaped to Canada after assassinating Lincoln and died in 1903 in Oklahoma Territory.
Further reading can be found online about her confession and the details thereof.