I loved Natasha Richardson as the Vicar's young wife, Alice Keach, in A Month in the Country. It's not an easy film to find, I have it on ancient VHS. It is such a beautiful, quiet movie.
The book is also wonderful. To me, she gave a performance that was just perfect, and she was very young at the time -- I think it was made in the late 80's.
45 is just too young to die. I really hope she recovers.