Filmmaker Jennifer Lee will make a surprise return to the franchise to direct Frozen 3 & 4. Lee rose to prominence as an animation director in 2013 with her feature film debut Frozen, which she wrote and co-directed with long-term Disney animator Chris Buck. The movie was a box office success, grossing over $1.28 billion globally against a production budget of $150 million. The film won the Academy Award for Best Animated Feature and spawned a successful franchise, with Lee and Buck returning for Frozen 2, after which she was appointed chief creative officer for Walt Disney Animation Studios.

https://screenrant.com/frozen-3-4-jennifer-lee-director-return-confirmed/