These marriages rarely ever work out because one person ends up being too happy and the other person ends up being too sad. And then things can become really dangerous if either person starts pushing too hard. Everyone has their breaking point.
She is lucky that she was able to get out of her marriage without anyone getting hurt. It is just sad that things had to get to that point. I hope that she will look for someone she can actually be happy with. Each person is capable of finding happiness in marriage as long as they marry for the right reasons and money is not one of those reasons.