What Happened With Bonnie And Isaac?

Bonnie Mechnie-Jenkins returns to Oakdale alone despite the last time she was seen on as the world turns almost four years ago come April 2008 she was headed to Florida with her foster daughter Sarah/Zara Travers the biological child of attorney at law (Thurgood) Marshall Travers Bonnie's nemesis and the man who d her mother. The way she's warming up like a heat blanket to Holden Snyder I take that she and Isaac Jenkins must no longer be together. I haven't been able to watch it much because of work so has she mentioned a word or anything about the deal with her and Isaac and what's going on with Sarah? I just find it rather peculiar for her to show up nearly four years later and mention nothing at all about her marriage and foster child. I'm not to thrilled about "the new" Bonnie, but i'm becoming a custom to her, she even looks somewhat like the original Bonnie. Does anyone have any information on why she's "really" in town and what happened to Isaac and Sarah, please notify me