Thanks, Lucia. I was able to obtain a copy of Mary's naturalization file from the Circuit Court of Lake County. I only recently learned that prior to the Cable Act of 1922, American women lost their US citizenship when marrying foreign men. At first I was confused how Mary could have been born in Pennsylvania in 1903, but also had a Naturalization record from 1926.
I also just sent a request to the Diocese of Allentown asking if perhaps they had a record of baptism or anything else on file.
Thanks!