Hi the waking may be a sign, I am not an expert for children or adults, but as I understand adults wake gasping for breath and a child would not be able to tell u that....
The crowding can indicate a few things, one a retroflexed odontoid it is the bone that hold the skull on the spinal column, and it has a natural curve to it, but a retroflexed one the curve is going in the wrong direction and press against the brain stem.this also causes less space for the CSF to flow.
I posted an explanation of this in this post -
http://www.medhelp.org/posts/Chiari-Malformation/Retroflexed-odontoid--EDS--Hashimoto-thyroiditis/show/1805134
I am not familiar with that Drs name, but that does not mean much....I do know of a children's specialist in Chicago a Dr Frim.....and here is the link to our list, keep in mind not all Drs treat children so u will have to ask....
http://www.medhelp.org/health_pages/Neurological-Disorders/DOCTORS-LIST-FOR-CHIARI-SYRINGOMYELIA/show/1062?cid=186
But do ask the Drs she is with now to test her for sleep apnea, there is a way to have a home study done so she is more comfortable and should be covered by ins...look into NovaSom and ask the Dr to do the same.