I think you mean that two people's lives have seen significant setback here. Brain injuries in general and concussions specifically are not minor injuries: their effects can last from months to lifetimes, impacting work and private lives.

I had a friend who "hit his head" and went unconscious; he died. We were warned that even if he lived, he would likely be a different person. If all the woman suffers is a few months of impaired cognitive functionality, she will be lucky.