Who is this person?

[AussieMick]

Er, no. Sorry, Laurie ... but you deserve another clue.
Apart from the German connection I dont think you could have chosen someone less suitable (sorry ... I know ... its easy when you know the answer). I'll think of a better clue ...

My person was not a journalist nor involved in the Civil War nor political nor involved in the assassination nor Lincoln's life pre-presidency.

I dont know if he even spoke to this woman.
(And actually , reading Wikipedia 's Henry Villard life story, I see that Henry was quite a rebel when he was young in Germany ... my person was a sort of rebel against the norm all her life. So there was a similarity.)

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As far as Lincoln biographers are concerned, I think only David H Donald refers to this woman.