Im glad your daughter only broke an arm and, then there's the emotional stuff. Im a law talking guy(lawyer), often defense. Passing the field sobriety test may let someone argue they weren't impaired but I doubt it will keep them from charges. The breath test on the scene isn't admissible in my state but it is reason enough to arrest on a charge, then take you to Station to blow into the breath test machine there that is reliable enough bring into Court. I'm sure she will get charged with something and pay restitution for the accident. The state DOT will probably suspend the driver's license.