There were quite a few Joyce Utly's. Here are some and maybe one is the right one. Your mtDNA should be identical to that of your biological mother. If you have an mtDNA test, you can find out about your mother's too. My mother's mtDNA indicates that her ancestors had lived in England for a very long time.
Joyce Utly
Daughter
United States Census, 1940
birth: 1935 South Carolina
residence: 1940 Silverton Township, Aiken, South Carolina, United States
father: Clifford Utly
mother: Betty Utly
other: Luela Utly, Leray Utly, Mary Utly, Anne Utly, Elizabeth Utly, Clifford Utly...
Joyce Percy Utley
Daughter
United States Census, 1940
birth: 1937 Alabama
residence: 1940 Election Precinct 10, Tuscaloosa, Alabama, United States
father: Chester G Utley
mother: Lucile Utley
other: Jeanine Utley, Mary Ann Utley
Joyce Utley
Niece
United States Census, 1940
birth: 1931 Indiana
residence: 1940 Ward 5, South Bend, Portage Township, St. Joseph, Indiana, United States
other: Galen D Ditsch, Burah Ditsch, Jane Ditsch, Jerome Ditsch, Jack Ditsch, Margaret Utley
Marilyn Joyce Utley
Daughter
United States Census, 1940
birth: 1928 Nebraska
residence: 1940 Ward 12, Omaha, Omaha City, Douglas, Nebraska, United States
father: Lester G Utley
mother: Muriel M Utley
other: Virginia Rose Utley
Joyce A Utley
Daughter
United States Census, 1940
birth: 1937 Georgia
residence: 1940 Ward 4, Augusta, Militia District 600, Richmond, Georgia, United States
father: Foster T Utley
mother: Annie D Utley
other: Foster T Utley
Joyce Utley
Daughter
United States Census, 1940
birth: 1937 Kentucky
residence: 1940 Ward 2, Madisonville, Magisterial District 7, Hopkins, Kentucky, United States
father: Charles Utley
mother: Pauline Utley
Joyce Utley
Granddaughter
United States Census, 1940
birth: 1923 Kentucky
residence: 1940 Eddyville, Magisterial District 1, Lyon, Kentucky, United States
other: Marie S Utley, Francis Utley, Mattie Utley
Joyce Utley
Daughter
United States Census, 1940
birth: 1938 Kentucky
residence: 1940 Ward 4, Norwood, Norwood Township, Hamilton, Ohio, United States
father: John Elliott
mother: Gertrude R Elliott
other: Delores Utley, Mary Utley
Joyce L Utley
Granddaughter
United States Census, 1930
birth: 1923 Texas
residence: 1930 Eddyville, Lyon, Kentucky, United States
other: Mary C Utley
Joyce E Utley
Daughter
United States Census, 1930
birth: 1925 Michigan
residence: 1930 Mount Vernon, Posey, Indiana, United States
father: Paul B Utley
mother: Louise Utley
other: Anna L Utley, Benjamin Utley, Stanford P Utley, Wallace Utley, Florence Utley