Hi and welcome to the Chiari forum.
I am so sorry ur DD is dealing with the symptoms and this condition in general.....and for u, as u watch ur child and deal with the frustrations of knowing what is best.
U will want to find a true Chiari specialist , one that does research on Chiari and treats only Chiari and related conditions,
More testing will be in order, to see if she has a CSF obstruction, disk issues, a syrinx, tethered cord, sleep apnea, ICP, POTS, ehlers-danlos, thyroid and vitamin issues....
I know this is all very overwhelming....but take it a day at a time and one area of this at a time.....there are a lot of articles and lists for tips with Chiari in the Health Pages from lists of Drs for u to use to research Drs, to activities to avoid to help avoid the triggering of more symptoms.
http://www.medhelp.org/health_pages/list?cid=186
Know u and ur DD are not alone <3