Here are the costs for Harvard Med School:
http://hms.harvard.edu/admissions/default.asp?page=costs
That's probably the worst case scenario. If I were you, I'd use those numbers for USA med schools to be safe.

If you don't want me in your business, then stop reading now. You've been forewarned.

You should not be paying for your daughter's medical school if you have to ask the cost. It's one of those "If you have to ask how much it costs, then you can't afford it." She is full grown, became an adult a long time ago and is still relatively young compared to you. So, she'll be in a much better position to pay off the loans than will you. At some point, you should resume living your own life to the fullest. If she doesn't have a goal of making good money after her residency, then she needs a reality check while not using your dime. Cut the cord.