I don't see how you can call it a "psycho cross country journey" - there's no telling how anyone would react under those circumstances and I think she was smart to do some serious investigating without disturbing the woman she was "switched" with. I imagine that most people, if they seriously suspected they were switched at birth, would react in a similar fashion. Wouldn't the curiosity just eat you alive?

I for one agree with the OP and think this lady should at least raise the question and conduct the tests. That's the only way her mind will ever be able to rest on the subject.