Death certificate states her parents were Walter Stults and Mary Allen

1910 Ohio/Ashtabula/New Lyme

2, a, Stults, Walter G, Head, M, W, 60, M1, 35, ,, Ohio, new York, Ohio, English, Farmer, General Farm
, Mary E, Wife, F, W, 56, M1, 35, 1, 1, Ohio, New york, New York, English, None
Hart, Cora A, Daughter, F, W, 33, M1,[blank] 5, 4, Ohio, Ohio, Ohio, English, None
, Virginia W, granddaughter, W, F, 6, S, Illinois, Ohio, Ohio
, Mildred A, granddaughter, F, W, 4, S, Illinois, Ohio, Ohio
, Frances L, granddaughter, F, w, 2, S, Illinois, Ohio, Ohio
, Walter E, Grandson, M, W, 1-3/12, S, Ohio, Ohio, Ohio

1900 Illinois/Cook/Chicago Ward 33/District 1045
fam #122, line 19 Stults, George W, Head, W, M, Jan, 1851, 49, M, 25,,, Ohio, Ohio, Ohio
, Mary, Wife, W, F, July, 1854, 45, M, 25, 1, 1, Ohio, New York, New York
, Cora A, Dau, W, Nov 1876,23, S, Ohio, Ohio, Ohio

Son of George W & Mary Allen Stults, George W. b. 3 Dec 1876 is listed in the Ashtabula Co birth index, but Cora is not listed.