Tā cóng dìfāng yīyuàn zhuǎnyuàn dào le dà chéngshì de zhuānkē yīyuàn.
She was transferred from a local hospital to a specialist hospital in a big city.
Tips
usage
转院 specifically means transferring between hospitals (医院). Do not confuse with 转科, which means transferring between departments within the same hospital.