Marietta Ritz Cohn. See notes for two fun facts.
1. Bubby had a big space between her two front teeth. If you look closely you can see that she filled that space with a piece of gum.
2. This portrait was put up on the mantel in Abe Cohn's house:
http://www.lighthouselubricants.com/cfpg-g3-family-album/index.php/album191/scan---Version-3