Stag's Leap is fantastic, it was the first book of hers I read. It goes into her mental state after a divorce, but no matter how removed your life and its concerns might be from a situation like that, she manages to pull you in.

I'll also recommend Adrienne Rich's Diving Into The Wreck and W.S. Merwin's The Shadow of Sirius. I actually read all three at the same time, all three quite good works.