Thank you so much for the response jcboy!
I simply cannot make out that signature.
This drawing was purchased by my mother-in-law at a "barn sale" in The Bronx in the early 1970's from her next door neighbor, Eugenia Sherman. Eugenia was a niece of General Sherman. She was very old at the time and was downsizing before moving into an assisted living facility. I've often wondered if she was the subject of the drawing.
Again, thank you for the response!