A google search brought her burial listing up at the Rose Hill Mem. Park Cemetery in Tulsa:
Haskew, Mary LaVerne Milnes, bur. 12/26/1990, Sec. Pineview (21) L-140 #6
http://www.interment.net/data/us/ok/tulsa/rosehill/index.htmPerhaps you could call the cemetery office, find out which funeral home was used, then call and ask for names of surviving kin and/or an obit or death notice. (An email address for the cemetery is given on the above link.)