"lc4, I don't think W is that miserable. She has always preferred being alone to being with others, even her own kids. She has very few friends. She told me that as a teenager she would spend hours outside playing by herself. In the last several years she would sit at her computer all evening playing games. She might be lonely but I think - yeah, I know, mind-reading - she is content."
There's a big difference in being a loner and in being lonely. Don't be so sure she's content. My H totally appeared to me that he's never been happier when he first moved out, and now I'm learning that he's experiencing anxiety and insomnia. I'm not trying to give you false hope, but remember what you see/hear from her isn't always an indicator of what's really going on.