Possible child out of marriage

My Great Grandmother may have had a child out of wedlock. I saw a birth record for a Hjordis Elevine Margrethe Larsen. Listing Dagmar Antoine Johannesen and Einar Larsen as parents. I cant see the actual document to verify dates of birth of Mother. I need to verify if this is my great grandmother or not. I believe she may have been rapped before she was married to my great grandfather.