I like your username, whattheseithakasmean 
The golden handcuffs idea is an interesting one and I agree to a certain extent. But the way I see it, for some women, beauty is their only bargaining chip. Yes, perhaps it could get them money, independence and the lifestyle they want in their own right - if they were a model or whatever. But sometimes it gets them that privilege through a relationship with a man. I suppose you could argue that accessing that means compromising and turning a blind eye to dickish behaviour, like Colleen Rooney has done (and with the greatest respect to her, she doesn't really have the physical and intellectual resources to have accessed the lifestyle she has on her own).
Of course, financial independence is something we should all aspire to and insist our daughters aspire to. But if a woman uses the assets she has to forge a relationship that gets her those things, within the structures we're all living under (footballers make more money than models, and have longer careers, for example), I wouldn't judge her for that.
Now, though, his career is toast - he has no future earnings to speak of. They're married, they have a child, she'd be entitled to a share of his finances on that basis alone. So why stand by him? She's got nothing to gain from doing so that she isn't already entitled to.