She must have been a hell of a nurse to diagnose a "concussion" before concussion pathology was clearly established.
"The sparse documentation of this data itself as it relates to concussion was largely subjective until the characterization of the tau protein in the 1970s, which resulted in the widespread establishment of concussion pathology shortly after." ... key word is WIDESPREAD
www.concussionalliance.org
That characterization of the tau protein happened in May of '75 ...
The words punch drunk, bell run, jolted, thumped were more commonly used up until recently, the word concussion was not a commonly used word. In 1985, I was knocked out twice in the same game from two separate open ice, clean hits, my coach who was also my PE teacher, exact words were he "got his bell rung he will be fine." Clearly I was concussed, the standard symptoms blurred vision, nausea, brain fog, poor balance ... had 'em all. A trained, licensed PE teacher didn't know about concussions in 1985, I find your story a little convenient.