Gallstones typically take awhile to form, so it's unlikely that the stones would be a result of a car wreck. It is more probable that she falls into the category of female at about 40 years of age and carrying some weight.
I agree but does the amount of fat in the bloodstream increase when you are involved in an accident because of being knocked around thereby enhancing conditions developing gallstones?
I do not believe gallstones can develop suddenly from any reason. I believe it takes time for stones to form and grow to a size that causes problems. However, you may have had gallstones for a long time and your gallbladder might be extremely inflamed, and if you are injured in the abdomen over your gallbladder, I would imagine that there would be a chance that the weakened wall of the gallbladder could be ruptured by that impact. But if that didn't happen and it's just a finding of gallstones, I agree it is just coincidental. Hey, my husband's appendix went bad less than a month after my gallbladder had to come out quite suddenly. There's another odd coincidence. Can't blame it on anything. Oh, and I never had an actual gallbladder attack until after my gallbladder ultrasound (just days later!). I don't blame the ultrasound for the gallbladder attack. I blame it on the fact that we had a party at work with both pizza and cheesecake. I wanted to go along with everybody and not make a fuss, even though I had not had an appetite for months and months. Knowing my gallbladder had stones, I tried to be sensible and just have two pieces of veggie pieces and two bites of cheesecake, you know, to be polite. The next day I had 30 hours of misery - my first gallbladder attack. If I hadn't just found out I had gallbladder stones, I might have thought it was a heart attack. It felt like I was having a heart attack, but lower.
This article mentions acute pancreatitis after blunt trauma causing fat embolus, but that's very different from gallbladder stones. That's the closest this article comes to a gallbladder problem. (That is, the pancreas is close to the gallbladder and can itself cause complications of pancreatitis, but there are many causes of pancreatitis).
http://emedicine.medscape.com/article/460524-overview