You should possibly suspect her (I’m joking) of studying the works of Jewish Chassidic philosophy which speak in exquisite depth about the love of G-d in terms of a coal... At times firery and at times seemingly cold or extinguished... But when one blows on it, the instead, internal flame leaps out. Ergo, your wife must be heaping those kind of coals...
Interesting! I emailed your comments to myself to do more research into that. I suspect that my ignorance of Jewish text and traditions does not do my Christian beliefs any good. I always find it interesting when I learn of things that are discussed in the New Testament that have a direct tie-in with the old.