Her face, above a spotted dress of dark blue crepe-de-chine, contained no facet or gleam of beauty, but there was an immediately perceptible vitality about her as if the nerves of her body were continually smouldering.
Although she is described as much younger, the image of Myrtle still provokes an idea of Yubaba from Spirited Away in my mind. Yubaba is an old, slightly chubby lady who exudes someone obsessed with wealth and status, just as Myrtle does. (https://vignette.wikia.nocookie.net/studio-ghibli/images/c/c6/Zeniba.jpg/revision/latest?cb=20170221161844)