I could not agree more. You are so right about Sarah and the unfortunate situation of the early years of her marriage.
Unfortunately there was also a strong streak of narcissism and immaturity in her personality and character. I don't know if it's still there but it has been plain as day up until very recently. But when I read her memoirs and read about the unbelievable emotional and verbal abuse she was subjected to by her mother Susan Barrantes it all started to fall into place. Her mother's cruelty and abandonment left a hole inside Sarah that I think she has been trying desperately to fill ever since. And the fact that she continued to be loving and generous to that woman-to whom she frankly owed nothing-reveals how big Sarah's heart is.
I don't know if it's too late for her and Andrew but I hope it isn't. And it's never to late to heal your life.
I agree that Sarah made some mistakes in the past, big mistakes, but I'm rooting for her to turn her life around. I think Andrew does still care about her a lot and that they have a good chance of working things out, but the hardest part probably isn't Sarah's relationship with Andrew: it's her place in the royal family. It seems that the Duke of Edinburgh will never accept her again and the royal PR people are probably not excited about the idea, either, for good reason.
But unless Sarah is a member of the royal family again, she will remain in limbo. Yes, she isn't a businesswoman, and in some ways I don't think she even wants to be a businesswoman, but she feels she has to support herself, because she doesn't want Andrew to have to support her indefinitely.
So she tries these business ventures to bring in money, but I think if she didn't have to worry about money or perhaps if she could be content with less, Sarah would probably rather be supporting her charitable causes and coming up with ideas for books/movies. (I read that she is working on a new movie about Prince Albert as a sequel to the Young Victoria, which did very well, and she has access to palace archives.)
At the end of the day, I think Sarah probably knows, more or less, that she made a mistake leaving the royal family and that she'd be a lot better off as part of it again, so I don't think we should judge her business schemes too harshly. Somehow I don't get the sense that her heart is in the idea of a business empire. I also think it's unfair to ask Sarah to stay so quiet that she never shows up at any event where she might be photographed (birthday party, for example). She is an outgoing person, so it would seem very at odds with her personality to retire away to the countryside and never be seen or heard from again. I think the biggest thing she can do to keep quiet is to avoid giving revealing interviews, which she has successfully done for the last 3 years or so. I think Sarah would be content supporting Andrew and her daughters in their work while working on charity and creative projects on the side, and I hope she gets to live that life. Even if she hasn't fully learned lessons from the past, I think she's trying to, and has been doing a pretty good job for the last few years.