Another possible set of answers would be something like "we left because we were tired of my husband and our kids being harassed. Nothing you're saying makes me want to move back here."

Rather than "why don't you apply to med school?" the LW could say something like, it's a shame that the insurance companies and the government make it so hard for a doctor to earn a living here. I can't help with that, maybe you should be talking to the governor/Congress/state legislature. People aren't going to want to hear "you haven't filled this position because nobody wants to put up with this crap," but they might understand "doctors and their families need to buy groceries and pay for housing too."