My Mother is a Fairy (A Novel) - Chen Danyan

Chen Miaomiao, a Shanghai teenage girl, is dumbfounded when one night she finds out that her loving mother is not a human, but a blue person who hails from another world. When her father begins to press for a divorce, Chen, with help from her best friend, tries to save her family from disintegrating. However, despite her endeavors and her mother's reluctance to part from the human world, the time comes when Chen's mother must return to her home world.