I am trying to get more information on my grandmother's birth parents, and I was hoping someone could point me in the right direction. We have some paperwork from the church she was adopted from, and this is what we know:

Birth Name: (Mary) Lorraine Topp
Birthdate: 10/15/1924
Birth Mother: Margaret Topp
Birth Father: Unknown
Adoption done through the Congregation of Holy Angels (Holy Angels Church) in Milwaukee.
Adoption Date: 02/13/1925
Adopted by a family with the last name of Dwyer

Any suggestions on where we can look for more information on her birth mother etc.? My grandmother has passed away, and we are researching for genealogy purposes.