“落入凡间的妖精”英语怎么翻译？

首先,这是个名词性短语,楼上用She is 的那位语法不合格

若楼主的"妖精"是贬义,指怪物的话,译作: ghost in the human world.

若楼主的"妖精:为褒义,指漂亮女孩子的话,译做: fairy in the human world

a spirit who fell into earthly world.

goddess from heaven.
形容女生的话就说, she is a goddess from heaven.

a pixy in the human-world