A 12-year-old girl has been diagnosed with a severe form of osteogenesis imperfecta that has resulted in thin bones and multiple fractures. She now presents for follow-up of scoliosis which was noticed by her mother 1 year ago. She has no back pain and is neurologically intact. Radiographs show a 42-degree right thoracic curve, which has increased from 31-degree from her previous radiographs taken 9 months earlier. What is the most appropriate management for her spinal deformity?