Those vary a lot.
I ride with a guy who had someone go down in front, he hit them and flipped over landing on butt/ sit bones. Cracked pelvis in 4-5 places in the front, weird guess the force traveled through the pelvis. Hospital like 4-5 days. Able to get in wheelchair about 2 weeks later. Hopes to return to work this week, about 3 weeks post accident. Lots of pain when he tries to move. He hopes he can ride in 3 months ... but that is probably optimistic. Hope your wife is better than that.