I bring back DVDs from the U.S. every year, and my German colleagues and students like to borrow them. It's important to ask your friend if she has a DVD player that accepts all regions and NTSC backup on her television, as otherwise there will be no color or no picture even if the DVD player has no regional chip. MuttigreeMom's sister and b-in-l probably did the same thing we did: Find out exactly what would accept U.S. norms before buying. Either that, or they lucked out.
DVDs are cheaper in the U.S. than in Germany, so the computer DVD players here will generally only allow you to switch the codes twice before locking in one code. ( I suspect a conspiracy between German software and DVD producers to keep out cheaper imports.) I've had a couple of students manage to lock in the U.S. code, and thereafter be unable to watch European DVDs on their computers/laptops. Some were able to reinstall their software, whereas others weren't. Just an advance warning.
You could also see whether you can get the film with "region 0", which can be played anywhere. My husband buys a lot of concert DVDs, and most of them are "0". I like Easterns, and buy Chinese films here with the "0" code.
Oh, and find out whether your friend already has the film on DVD, because if the original was in English, a German DVD would also have the original version (with or without English and/or German subtitles).