isn’t meant to be disrespectful, but medically speaking it would be significantly more likely that that is all psychosomatic or being driven by an underlying psychogenic process. That doesn’t mean she’s “faking” it or “attention-seeking” or that it’s a cry for help with some underlying depression or mental disorder etc, more that this likely reflects something very complex in play in a teenager brain that probably can’t be explained medically by a single concussion.
I don’t know the route I would take nor will you likely get great guidance here with our fractured healthcare system but I would try and find some sort of therapist that could start working with her in some sort of cognitive-behavioral therapy.
I’m not a neurologist and don’t deal with concussions or traumatic-brain injuries and I’m sure you have a peds neurologist guiding you but just something I would look into as a father.
Sorry you guys are going through this.