What comment does the narrator make concerning “mother-woman?”

From the text:

In short, Mrs. Pontellier was not a mother-woman. The mother-women seemed to prevail that summer at Grand Isle. It was easy to know them, fluttering about with extended, protecting wings when any harm, real or imaginary, threatened their precious brood. They were women who idolized their children, worshiped their husbands, and esteemed it a holy privilege to efface themselves as individuals and grow wings as ministering angels.