I agree with sdkashif.
The speed of the accident is fairly high for both parties. It has been roughly a year since the accident (or was that a typo?).
I have attached a file which contains the Australian NSW Motor Accidents Authority's Whiplash Guidelines. These include the classification of Whiplash Associated Disorders and the clinical pathways recommended. It can also be found at http://www.maa.nsw.gov.au/default.aspx?MenuID=141#127. It may be of help to you and justifies it position based on the evidence available as at 2003 i think.
Now, If it has been a year since the accident, then she is a chronic pain patient. She will be probably deconditioned and need deep neck flexor exercises, motor control retraining and rehabilitation with functional exercises. A good resource would be Diane Lee's book "The Thorax" available from her website dianelee.ca. It contains good functional rehab stuff for the thorax and UL.
Now, if it has only been 6 weeks, i would say that what she is feeling is pretty common. The jerking forces and impaction on one side of the spinal column and stretching of the other side is pretty great at 35mph. If she turned her head to look at the car coming at her, it would be even worse because on one side, the joints would be in closed packa nd the other side would be stretched open.
Good luck. Let us know more please