First, law school is a numbers game. She will not be disadvantaged by choosing any of those schools. She simply needs a strong GPA and LSAT score. Law schools have been big on getting their numbers up lately.
Of the universities you mentioned, I would recommend Berkeley or NYU.
I had similar ambitions. I ended up double majoring in history and international relations with a minor in economics. I also worked in the Office of Study Abroad at my university and now run international education programs for a non-profit. When it comes to study abroad programs, GW is lacking. NYU is OK but a still meh for my taste, which leaves Berkeley - definitely the better choice. I'd say study abroad is one of the more important things - I believe it should be a requirement for most degrees and universities. I'd suggest Brussels, Strasbourg, Geneva, or London for her.