The Ada newspaper archives are online at a paid newspaperarchive site. There are several articles about a Leslie Prince, including a few dated in the 1950 and 1960's about Mr. and Mrs. Leslie Prince.
There is an obit for Mrs. Prince on the first page of the January 6, 1960 and continued to page 2.
Since there are several articles about the family, you would have better success on the newspaperarchive . com site in finding more information about Lucille and her husband, besides nieces and a nephew.