JW Booth and Quinine

[Leonard]

Has there been any further development of the Josephine Brown vs. Sarah Slater research? I'm wondering if the mysterious lady that John Surratt was escorting to and from Richmond and New York could have been Josephine Brown instead of Sarah Slater. Weichmann says he was not told the mysterious lady's name, but that he later learned that it was Sarah Slater. Are we sure he was right? Azterodt's confession to McPhail (long hidden in attorney Doster's file) says she went by Brown. Tom Conolly's diary (An Irishman in Dixie) places Josephine Brown attending church with him in Richmond on March 10, 1865, and her father John Potts Brown tells Conolly on April 22, 1865 that she was in Canada. These dates correspond to trips typically assigned to Slater. How do we know that the mysterious petite French lady in the veil was Sarah Slater and not Josephine Brown?