Possibly her C1/C2 {or atlas/axis} cervical vertebra might have gotten knocked out of alignment also. Most MDs don't really look into that scenario.

some info on it-
Chiropractic care info- a good/expert one can help with many symptoms:
http://www.upcspine.com/self.htm
http://www.uppercervical.org/subpag...b/about_faq.php
http://www.spineuniverse.com/index.html
http://www.coloradochiropractic.org/.../glossary.html