Whatever decision she makes is none of your business. Once you've given her a piece of your mind and that's enough. You couldn't change her let alone decide for her. As a responsible adult she should be ready enough to face the consequences of her choices. Getting married isn't always tagged as a "happily married", but come the time she chooses this path, I know she will overcome whatever is ahead of her. I was a divorcee too and I know the pains of it. Also, give the guy a chance. Who knows? The guy might change or grow up into a hubby or dad your best friend wants him to be. But then again everything in life has risks. And let your friend savor those moments, and learn from them.