Be aware that SPOILERS are ahead for Fantastic Beasts: The Crimes of Grindelwald. Continue at your own peril.
Creator J.K. Rowling is known for adding intense plot twists in the Harry Potter universe, and the narrative for Fantastic Beasts: The Crimes of Grindelwald is no different.
At the end of the film, the kind-hearted and upbeat Queenie Goldstein, portrayed by Alison Sudol, can be seen joining Grindelwald on the “dark side,” shocking everyone but herself.
In an interview with EW, Sudol spoke about her character’s twist, and why she understands the decision Queenie makes.
Source: IGN.com Alison Sudol Defends Her Character in Fantastic Beasts 2