That reads as somebody experiencing PTSD in addition to the injury. The "am I me" and new perspective on work and life happens as a consequence of life altering tragedy.
I have a similar injury and I'm honestly not sure how you can not have a PTSD with a brain injury of this magnitude. So there's no need to write "in addition to". The PTSD is part of the symptoms of this kind of injury.
The first year was especially tough, with a lot of suicidal thoughts and constant self-doubt.
For what it's worth, my son has this injury (severe brain trauma), approximately 30% of brain is non existent.
He doesn't have PTSD as it happened when he was a baby along with a large number of complications.
I got PTSD with all of the multiple surgeries (and wishing goodbyes), EVDs, shunts, life and death decisions, and witnessing near death on a few occasions for him over months. The only positive is I can see PTSD in other people from once having it myself, and it is heartbreaking because I know exactly what they are going through too.
The "in addition to" was to note the change of behaviour she's noticed, not the fact you couldn't have PTSD after an injury. :)
For example she mentions she forgets stuff (the injury probably) then also mentions about not feeling motivated (the PTSD).
The first year was especially tough, with a lot of suicidal thoughts and constant self-doubt.