I so appreciate her performance in The Handmaid's Tale. I've lost count of how many times I've watched that movie.
Sometimes it is not the amount of force involved in a blow to the head, but the location. One should watch out for signs of brain injury any time there has been a blow to the head.
ETA: More on "talk and die" syndrome, where people look and feel fine after a blow to the head only to die later from delayed bleeding in the brain. Other scenarios are covered in more detail than the other article I linked to.