Having been in 2 major accidents myself (both my fault btw, freely admit it), I can fully sympothise. Make sure she gets everything checked more than once. When I had my head-on collision, I was taken to a rural hospital 5 minutes away, poked & prodded, "does this hurt, does that hurt." Considering I was still in shock, nothing really hurt except my chest where the airbag had hit me. Later I came to find out that my knees were pretty banged up, and now I can't run, ski, etc for very long.
My sis had a minor accident, didn't go to the doctors, & then 5 months later had to have her spleen removed.
Make sure your wife doesn't slack on medical stuff, ya never know.