A New and Different Summer by Lenora Mattingly Weber

Katie Rose's good friend, Jeanie who is adopted, fears that an unpleasant newcomer in town is her biological mother. Katie Rose takes the opportunity while her mother is away to run household in a "sophisticated" manner. Part of her motivation is in impressing a young restaurant management student named Perry McHarg. Will her use of more "refined foods" such as packaged cake mixes and frozen foods make the difference? Softcover edition.