All of the traits you’ve described also very much fit PTSD as well.
To me taking a Watsonian approach to the character we she a woman who was forcibly taken by the Borg and assimilated at a very young age, then years later ripped away from that as well. That’s two extremely traumatic events( that we know of). Then following on we see the character years later at a point where she has somewhat worked though those traumas.
A Doyalist reading we can say it was the 90s and discussions around neuro-divergency and more general mental health were far less common in media. So we’re probably both over reading things.
The third season is pretty good. Second started out well but then didn’t know where they wanted it to go. I’d definitely say PIC overall is the second weakest of new trek after DIS.