"Divine" with a capital D is used for God alone. I should have made that distinction.
Don't be so Protestant. I've seen it both capitalized and uncapitalized. Take, for instance, this edition of
The Glories of Mary by St. Alphonsus Liguori:
http://archive.org/stream/gloriesmary00ligugoog#page/n296/mode/2up/search/%22divine+mother%22This edition has not just one, but two Imprimaturs from two separate Archbishops. It uses both "Divine Mother" and "divine Mother", mostly the former.
On this topic, I was reading the following article about Msgr. Ronald Knox:
The Problem of Monsignor Ronald Knox — A Painful Post-Mortem | Catholicism.orgOne quote from it, which I think is particularly pertinent, is:
A few weeks before his death, Monsgnor Knox completed work on a new English translation of the autobiography of Saint Therese of Lisieux, the Little Flower of Jesus. The book has just been published in this country and has been hailed as witness to the “abiding influence” of the late Monsignor.
Nothing, however, could be better calculated to show him up and finish him off than his current literary association with the Little Flower. For if ever there were antipodal personalities they are Therese of the Child Jesus and Ronald Knox of Oxford. In clothing her thoughts with his words — adjusting her style to his standards, dressing up her images, enlarging her vocabulary — he has done his best to transform her into a stuffy, British, slightly less masculine, more pious version of himself. Typical example: Saint Therese writes, “I laugh now at some things I did.” (Je ris maintenant de certaines choses .) Monsignor Knox elaborates this into, “It makes me laugh now to think what heavy weather I made over nothing at all.”
But in the end it is Therese, her brightness and clarity, who prevails, and Monsignor Knox who gets snowed under — as in his miserable attempt to portray her as an inferior theologian for having called Our Lady the “Divine Mother” of Our Lord. After correcting the text to read, “his own Mother,” Monsignor Knox adds the footnote: “The Saint by a slip of the pen has written ‘his Divine Mother.’ It is evident that she never revised these last few paragraphs.”
Among the scores of Saints who gave Our Lady that most fitting title, Divine Mother, and who showed no inclination to revise their paragraphs, were the following Doctors of the Universal Church: Saint Gregory the Great, Saint Bernard, Saint Ephrem, Saint Peter Damian, and Saint Alphonsus Maria de Liguori.
I would hope that you wouldn't consider yourself to know better than these saints.