NeuroTalk Support Groups - 14 year old daughter constantly dizzy since Dec 2016

I am looking for ANY leads on what direction to go. Brief medical history. She had a mild concussion in Feb of 2016. Constant dizziness started around Dec 2017. Not so much spinning, but wobbly constantly. On low end its a 2, on bad days its a solid 8 or 9 and she can't do any physical activity and have to pick her up from school (which has rarely happened). We've seen pediatrician, ENT, neuro at UCSF in San Francisco. Had chiro done, eyes checked, EKG, extensive inner ear testing at UCSF (not inner ear issue according to them), brain MRI (clear). She is excessively fatigued (more than normal teen) and neuro says that can be attributed to her constantly trying to stay balanced throughout the day. We do not want to medicate her if possible. She's only 14 and growing. Most recent MD who is also functional dr. thinks a variety of things might help - brain support for starters. Could be lack of O2, mitochondria need support, microglial cells could be in constant state of "on" , some axonal shearing from mild concussion. Stress makes it worse (she's in counseling at school and we make sure she's getting exercise as best as possible and keeping her load light), heat makes it worse, and too much exercise makes it worse too. We've also tried gfree diet, salt increase, water tracking. She's not a dramatic girl or a complainer so at this point we know what she's experiencing is very real. Recent dr. had her do some motor movements and she says they are on the slower side. She's currently taking Vit D as she's low, liposomal glutathiamone, and omegas. Just started last week. In one week we go back to check in and also try neuro osteopathic work. We are at the front end with this new dr. but she specializes in brain so we are hopeful. But this is my first time reaching out to a discussion board to try and get some outside thoughts from those with similar issues with child (constant dizziness). And when I say constant I do mean literally all the time.