Thinking about it, I think Kate got stuck in an awkward era of Hollywood - where her acting strengths and style were being superseded by a new generation of bottle blond barbies. Quite a few talented actresses of her era fell victim to this "plague".
I think it's always been like that. In fact, I'd say that we're living in the best era for middle-aged actresses in Hollywood, where they can find interesting roles in movies and especially in television. Twenty or forty years ago, Hollywood didn't know what to do with actresses such as Katherine Erbe, Edie Falco, Rachel Griffiths or Melina Kanakaredes, to name just a few. These days, they're everywhere.