Yeah, any neck injury should really be checked out, even if apparently minor, and without police being involved, she will need some proof of the accident to make any claim against the old fella (although I guess the state of his car will be proof enough) so it would be worth getting it recorded on medical records. At least there is a witness.
We might need to nag her to get her neck checked out over the next few days, she strikes me as the kind of person who won't make a fuss.
We've recently had to sell my mum's car (she turned 70 this year) and surrender her licence as she is diabetic, has just recovered from heart attack, kidney failure and pneumonia, and has high blood pressure and undeniable signs of early dementia, and her GP told her that he could see no reason why she couldn't drive!!!
Apart from anything, there is no way she could have managed to fill in the DVLA renewal form and attach all the various info without help. Mum knew she wasn't fit to drive but we were worried that she would forget and would go out in the car, or would forget to tax / insure it. We were worried sick not only about her but about the consequences on other drivers. It was very hard to do and took along of talking to finally get mum to get rid of the car (she kept forgetting that she had agreed to get rid of it). Let's hope that this accident will mean that the old man's family / GP etc will realise that it's probably time for him to surrender his licence, and that both he and Jen have had a very lucky escape - next time neither he or the other party involved might be so lucky.