Usually someone that develops sacroiliitis and has Crohn's is said to have spondyloarthropathy associated with inflammatory bowel disease. It really the same thing as ankylosing spondylitis but many rheumys do make the differentiation between the two.
When the doctor said your daughter had SI arthritis did he say she had inflamed SI joints? Did she have an xray or MRI or did he just diagnosis it based on physical exam?
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CD, Ankylosing Spondylitis, lupus, small fiber peripheral neuropathy, avascular necrosis, peripheral artery disease, degenerative disc disease, and a host of other medical problems.