The D of P could be daughters of something, kind of like Rainbow Girls is a Masonic fraternal order for young women whose fathers are in the Masons. And Eastern Star will take young couples, I am not sure if they will take men and women separately, but fraternal groups are not just for older people. Do you know if there were any family members later on, in known fraternal groups? That might be a clue as to where else to look for information. I have heard of Knights of Pythias, which I think is Jewish, but I do not know for sure. But it could be Daughters of Pythias, if they were in Philly.