It was addressed to Anna Carrie Vorberg on S. 12th street, St. Louis but not sent with a stamp. I know Anna lived on S. 12th street in the 1910 census and she was married in 1917, so that gives me a clue that it was sent around that time--and it is clearly marked with Hazel, Helen, and Howard.
I really believe the first communion girl is a Vorberg just based on her features, and the family is small. She has two other girl cousins b 1890 and 1892. Is the general consensus that the first communion picture is older or younger?
Thanks for your help!