Accent on April by Betty Cavanna (1960)

Kathy McCall buried her face in her hands and collapsed in tears. Then unexpectedly, she began to laugh, a little hysterically. "Goodness," murmured her mother, "storms and sunshine. I'm certainly glad April isn't often." Mrs. McCall, of course, was thinking of the sudden storms of the teen-age years. Kathy, however, decided that for most of this past year the accent had been on April in their home. (from the inside flap)