I doubt she had any say in anything. All the members would have stayed together regardless of outside drama if they'd been on a good foundation to begin with.
Have you ever flown a kite in really windy conditions?
Have you ever thought to yourself "self, you are fucked up cause alllll you think about is sex with different women." As you look at happily married people that stay true to one another and you know that will never be the case with you?
No. Different strokes for different folks. Some people want stability, dependability, emotional comfort and consistency, other folks want randomness, exploration, variety and maybe ever drama, etc... Many swingers are very happy in their marriages.