Thank you all for your prayers.
I haven't logged in since the last time I posted this, so I thought it only fair to provide an update on my sister for all who so graciously prayed for her (and your continued prayers are asked).
After 3 years of hell for her we are finally beginning to find some answers (as an aside, the doctor who was so helpful in making this giant leap forward is a Greek-American). It seems she has lupus, as well as rheumatoid arthritis. This is in addition to Post Traumatic Stress Disorder and depression. So she is dealing with quite a lot for a young woman. Currently she is still living with my parents, still doesn't have her college degree (she had to drop out when she was in her final semester because of her illness), and although she is 26 her life has been on hold for the last 3+ years. She's now started on some steroids and other drugs to find out what will be a best fit for her as she comes to terms with this lifelong condition.
Thank you all for your prayers.