Who is this lady?

[RJNorton]

I am truly amazed and surprised. I believe I own over 80 books on Lincoln's assassination, and I don't ever recall seeing this information in a single one except I now recall it's in Manhunt. When the article says, "Alone with his fallen chief, Stanton cut a generous lock of the president’s hair and sealed it in a plain white envelope"...I wonder how this is known. Despite what the Smithsonian Magazine says I remain surprised. However, I do know the article's author, James Swanson, is an expert, but I do not remember that he included this information in Bloody Crimes. It's only in Manhunt and nowhere else as far as I know. Mr. Swanson says he examined it in a private collection. I guess I will have to trust his judgment, but I am still somewhat shocked to think Edwin Stanton cut a "generous lock of hair" for Mary Jane Welles.