|Lillian, mysterious and sinceere.|
Estelle was born in 1909. As a starting point, I'm going to offer this theory. If Lillian was a high school classmate, that would put this photo in the date range of somewhere between 1925 through maybe 1930. It would also mean that Lillian lived in Elizabeth, New Jersey.
Of course, I could be entirely wrong about that.
If you recognize this sincere and lovely lady, please get in touch!