Sadly, this hasn't been mentioned on the other, literature forum I post on. And on the 4chan /lit/ subsection (yes, I go there) it was mentioned, but no one made any responses to it. She's sadly not someone I've came across, I haven't read a lot of sci-fi in years, and fantasy I sometimes even try to avoid. It's always sad to lose a fellow person of the pen though. Maybe I should check her out some time.
I just read her obituary in the Glasgow Herald about an hour ago. Sad that so many of her books are no longer in print.
She was an amazing writer. One of the first women to storm into SF/F with strong feminist themes. The first book of hers I ever read was The Birthgrave, many years ago, and I was hooked on her work after that. There's a brief review of The Birthgrave here: http://agelesspagesreviews.blogspot.com/2012/02/review-birthgrave-by-tanith-lee.html Originally published in 1975. I remember thinking Death's Master, which made her the first woman to receive the British Family Award, was good but not quite as good as her work that had come before. That's essentially the conclusion made here as well, I think: http://www.theguardian.com/books/booksblog/2010/aug/27/fantasy-death-master-tanith-lee