The grandmother had a divine beauty. How does the author bring this out?

The author's grandmother had a divine beauty that seemed to emanate from her piety, even though she was short,fat and slightly bent, the author writes about a serenity that comes from observance of a pious life. He writes that she could never have been pretty but she was always beautiful,dressed in pristine white,one hand balancing her stooping body and the other engaged in counting the beads of her rosary. She was quite old, her silver locks untidily framing her puckered face as her lips constantly moved in prayer. Her beauty was that of a disciplined monk, living a life of prayer and piety, soothing as a serene winter landscape in the mountains which had a calming effect on those who beheld her.