I have no medical background. Still I believe she should see a neurologist.
MDA pays for initial diagnostic examination here if you follow their procedures. You can find phone number of your local branch from www.mdausa.org and check if they cover her too. At least they can refer you to good neurologists. www.mdausa.org is a very informative site. You can also ask expert question through that site.
这么小的孩子可能不会给她做胸腺切除手术,risk太多。自身免疫性疾病国内治疗比较aggressive,因为保守疗法很多比较昂贵,要是有机会来米国看看就好了。我觉得这里的医生不太可能会仅仅根据病历来做什么事,除非是很熟的医生。你可以在网上做一些research,或许可以找到一些support group来交流交流。 Best of luck (匪兵乙的回复)