intertext

This happens a lot in Charlotte Yonge's novels in contemporary settings: e.g. Countess Kate, the trajectory of Ethel May through the various volumes that deal with the May family. There's often a disciplining process happening as well - training the wild and unproductive or simply misdirected energies/sensibilities into productive channels.

One of the few Enid Blytons of which I can remember an actual plot, Six Cousins, has the spoilt and wimpy girl cousin becoming less of a wimp, and her slovenly tomboyish cousin becoming less rough-edged.