Why go to Peru with him?

They planned a trip to Peru for the day after Christmas because it's "something we've always wanted to do" and because it's differernt and exciting. Now the youngest daughter has said she doesn't want to go on the trip, and Nancy is letting her stay home alone (with friends nearby, of course). I guess the thing that bothers me is: if she can't stand the guy anymore and is going to divorce him in a year or two, why is Nancy going on this trip? Why would she go and spend time with the man that supposedly doesn't care about her and is just not intimate with her anymore? It's all very odd. I have to hope that the youngest daughter resisted the trip in the hope that this coukd be a time for love to rekindle between Nancy and her husband, but I fear that it is more of a selfish desire to stay away from conditions that are different and not to the younger daughter's liking. It might be that she doesn't want to hear the bickering, too. Who knows? I just know that it's odd for Nancy to be going on such a major trip with the man she is going to divorce soon.