Since we know (or assume) she'll be running for president, I feel this will be a book written with a purpose. It will be a "I was naive and didn't realize what he was doing, I was loyal and stood by him, I was hurt like any other woman" story. It will be a combo of having us admire her intelligence, feel sorry for the abuse she went through and feel proud of her strength ...
I'm not saying she should have left him. But to put out a book right now seems more a deliberate publicity stunt with a deliberate aim than anything else ...