Mulan is the only Disney Princess whose live-action remake was directed by a woman: Niki Caro directed the 2020 film Mulan.
Caro, a New Zealand filmmaker, was hired to direct Disney's adaptation of the 1998 animated movie. Her version drew on both the animated film and the Chinese legend of Hua Mulan, the young woman who disguises herself as a man to take her ailing father's place in the army. The remake removed several familiar musical and comic elements while emphasizing martial arts, family duty, and military action.
The distinction is about the live-action remakes of Disney Princess films, not every Disney movie featuring a female hero. Other prominent remakes were directed by men: Kenneth Branagh made Cinderella, Bill Condon directed Beauty and the Beast, Guy Ritchie directed Aladdin, Rob Marshall directed The Little Mermaid, and Marc Webb directed Snow White.
Mulan's production also became notable for its scale. With a reported budget of about $200 million, it was widely described as the most expensive film ever directed by a woman at the time of release.