Is that a wig, it looks like she lost a lot of hair which is unusual for women.
Women’s hair gets thinner as they grow older. So there may be balding like spots intermittently, unless she has a great hairdresser or wears a wig.
Also, she played Brian Piccolo’s wife, Joy, in “Brian’s Song”, a made for TV movie.
Seems like it’s a hormone thing. Some women lose hair later in life...