The movie opens with a young woman driving through the country side. She runs over a hedge hog or a possum, stops gets out, then continues. She soon stumbles into a war zone, where the opposing sides are male and female but are otherwise normal modern infantry. She ends up in mansion inhabited by a group of children and perhaps others. At one point, she plays the piano to accompany two children who sing a love duet from Wagner. I've been looking for this movie for years. Any help would be appreciated. Thanks in advance.

Black Moon

That's it. Thanks.

You're welcome.