The information regarding Susanna's last name was from the marriage record of Thomas Grogan and Anna Boler. The rest of the information that I have about her:
1900 Federal Census: Stanley, Chippewa County, WI
Grogan, Thomas, age 29, born July 1870, born PA, father born IR, mother born Canada, a teamster
Annie, age 23, born March 1877, born Holland, parents born Holland, arrived in US 1888
Gertrude, age 2, born July 1897, born WI
1910 Federal Census: Stanley, Chippewa County, WI
Grogan, Thomas, age 38, born PA, father born Ireland, mother born Canada, teamster in a lumber mill
Anna, age 38, born Belgium, father born France, mother born Holland
Gertrude, age 12, born WI
Pauline, age 9, born WI
1920 Federal Census, 23rd Ward, Milwaukee, Milwaukee, WI
Grogan, Anna, age 42, born Belgium, parents born Belgium, milliner in a hat factory
Gertrude, age 22 born WI, a teacher in a publice school
Pauline, age 19, a typist in a machine shop
1930 Federal Census, 23rd Ward, Milwaukee, Milwaukee, WI
Grogan, Anna, age 53, widow, born Belgium, parents born Belgium, a milliner in a millinery factory
Grogan, Gertrude, age 32, born WI, father born PA, mother born Belgium, a teacher in a public school
Grogan, Pauline, age 29, born WI, father born PA, mother born Belgium, a teacher in a public school
Stanley Republican, 1/6/1955
Former Resident Dies in Milwaukee
"Mrs. Anna Grogan, nee Boler, passes away in Milwaukee last Friday, December 31. Mrs. Grogan, a resident of Stanley for many years, left here with her husband Thomas about 1920 and has resided in Milwaukee since that time. Mr. Grogan passed away shortly after leaving Stanley.
Surviving are her two daughters, Mrs. Gertrude Sigurson and Mrs. Pauline Strassburg.
Funeral services were held Monday morning at 9:00 in Milwaukee from St. Mathew's Church with interment in Holy Cross cemetery."
Milwaukee Journal, 1/2/1955
Grogan, Anna (nee Boler): Dec. 30, 1954, residence 3216 W. National Avenue, widow of Thomas Grogan, mother of Mrs. Gertrude Sigurson and Mrs. Pauline Strassburg, sister of Mrs. Elizabeth Cleveland, Mrs. Mary Kenney, Mrs. Theresa Stuttgren, Mrs. Clara Hammersmith, Nickolas and Alfred Boler, grandmother of Thomas Strassburg. Funeral from the Brett Funeral Home, 2001 W. Wisconsin Avenue, Mond. At 8:30 to St. Matthew's Church, S. 25th Street and W. Scott, at 9. Interment Holy Cross Cemetery. Rosary vigil Sun. evening at 8 o'clock. In state Sunday after 2p.m.