What the Heck! Disability Denied!

My sister was severely injured in a car accident 2 years ago. Because of this accident she has disabilities that she will ALWAYS have. She filed for disability thru the government and guess what she was turned down can you believe it! I told her to get a disability appeal. So she has filed the paperwork to appeal their decision. Why would they turn down someone who is so evidently disabled? She has all the medical documentation to prove her disability what do they want her first born too?