How is Catherine Mingott described in Chapter Four of the novel, The Age of Innocence?

From the text:

The immense accretion of flesh which had descended on her in middle life like a flood of lava on a doomed city had changed her from a plump active little woman with a neatly-turned foot and ankle into something as vast and august as a natural phenomenon. ... [In the mirror she saw] an almost unwrinkled expanse of firm pink and white flesh, in the center of which the traces of a small face survived as if awaiting excavation.