True whiplash (not this fakeola crud where people get out holding their necks) kicks in a day or two later. I've gotten it a couple of times in bike crashes. You feel fine, but gradually the muscles in your neck get weaker and more sore, until they can't pull at all, and if your head tilts in the direction of the original stress it will just keep on flopping (got use your hand to tilt it back). After a few days of that they recover.

Definately a good idea to get seats with headrests in old Volvos. I'm surprised your wife didn't get injured, and the passenger in the car in front of her did - presumably that car would have had headrests. Maybe they were sitting funny or in the rear seat?

I didn't see that the front was mashed too - I think it was just a rear picture in the gallery.
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I'm JohnMc, and I approved this message.