Your great aunt was in a number of shows with Henry Fonda on Cape Cod and in Baltimore, Maryland, between 1928 and 1932. They were both members of a Cape Cod summer theatre known at the University Players. Your great aunt was born and raised in the Roland Park section of Baltimore and graduated from Bryn Mawr girls school there. Two of her classmates in 1928 also became professional actors: Margaret Barker, who was one of the founding members of the Group Theatre, and Mildred Natwick, who also became a University Player and went on to a great career on Broadway and in film. Contact me if you'd like to know the specific shows they did together. See also the Wikipedia page on your great aunt.