I’m sorry to say that I think you’re stuck while the father is being so useless. If his view is that his daughters role in life is to moon about until some guy comes along to take care of her, and she is also of the same view, then I think the best you can do is to be supportive of anything that gets her out of the house (including useless studies) and exposed to more of the world and different world views. Hopefully she’ll come to her senses and husband can then support her in her new choices. You have the sympathy of a random internet stranger.
Obviously true? In real life I’ve found it’s often worth doing a bit of thinking / effort to find a third option though. Not always possible though - like when voting - though I don’t think picking the least worst (imho) option when it comes to political representation is immoral