Frozen Wine: Is it ruined?

I received the message below the other day from a reader. While she certainly has dealt with her problem by now, I thought the question was interesting enough to post. "Help! I had a split of pricy champagne in the back of my fridge and pulled it out the other day to find it was frozen! #$%^! After placing it on a lower shelf it has thawed but is it any good? Or should I pitch it? Any thoughts???"