Is there benefit for a child with horrible scoliosis to see a chiropractor?

No . There is no chiropractic treatment for scoliosis unless the scoliosis is from a spasm due to a disc herniation..
Depends... First and foremost, your child should be seen by a pediatric orthopaedic surgeon specializing in scoliosis. Once that has been done, a chiropractor can be utilized only as an adjunct to the treatment prescribed by the specialist.