Who is this person?

[Eva Elisabeth]

Kudos, Roger, you nailed it! And Gene is right as Dr. Houmes once pointed out the ears determine a person like fingerprints.

Here's some info on C.D. Hess, and it's a very interesting site at all (IMO):
http://www.operaoldcolo.info/personages/company9.html

On April 2, 1864, the Lincolns, the Seward family and Julia Grant attended Charles Gounod's "Faust" at Grover's.

Roger, you win this wonderful "Walpurgis Night" scene from "Faust", here brilliantly and famously performed by George Balanchine's NYC Ballet:
https://m.youtube.com/watch?v=9Q3mTBtTOZ8

While the opera first premiered in 1859, the ballet was inserted in 1869, thus the Lincoln/Sweard/Grant party at Grover's missed it.