Who is this lady?

[Eva Elisabeth]

Kudos to everyone (Roger, you know how to read my hints!) - And thank you so much to Scott and Susan for your help to identify and email the "culprit". I was amazed to see it on find-a-grave:
http://www.findagrave.com/cgi-bin/fg.cgi...id=9270712
I was quite sure to have seen it before but likewise certain it wasn't Abraham Lincoln's sister as any portrait of her would be "commonly known" (and my idea, too, was to contact the owner but it's easier when you can provide who it is instead). [PS: Please notice my question was who this lady is SUPPOSED to be!]

Thanks again to everyone!