caroline, I don't know anything about the Barnard/Columbia program -- I just am a person who went to law school & practiced law for about 20 years. I would NOT recommend an accellerated program for law school -- I simply think that is giving short shrift to the value of the undergraduate education. Law school is also very intense & very focused- not really something to rush into. I realize that you might be thinking about overall costs (1 less year of college to pay for) -- but I still think that anyone doing this would be missing a lot.
Anyway, the point is that coming from the perspective of an adult with a law degree... I would not encourage that path.