I don't think your wife will listen to her parents' requests to R any more than she'll listen to you. She is going to find enablers to tell her what she wants to hear and ignore all else.
I'd be interested in hearing what others have to say, but I think the most that you could ask her parents to do is to ask her to take her time and not to make any big life decisions too quickly. Time is your friend, and it doesn't make demands on your W.
