Mommy's Little Princess (2019)

"After living with her drug-addicted mother, 10-year-old Lizzy's adopted by career woman Juliana and her boyfriend Greg. Julianna buys Lizzy an online genetics test and they discover that Lizzy's related to a royal German family, but as Lizzy's fascination with being a princess grows, the girl begins to lose her sanity, blurring fantasy & reality.