Do you remember if her headrest was adjusted properly? If she does give you problems, improperly used safety devices on her part may reduce liability.
There were a lot of brocures about this at my insurance company because of the amount of injury claims for whiplash, which would have been prevented with a properly adjusted headrest.
Just for fun, look as other vehicles as you drive or walk by, and you wioll notice that almost none are adjusted properly.
--from some manual, I forget where---The top of the drivers ear should be as close to the centre of the headrest as possible.