Petit Maman is maybe my favourite film about girlhood; itās spare and soft and ruminative. Miyazaki movies are also often centered on girlhood, and feminine adolescenceā Kikiās delivery service, and the Secret World of Arriety, are two that I would recommend.
Extended (nonexhaustive) list: Catharine Called Birdy, Dirty Dancing, Turning Red, The Quiet Girl, Eighth Grade, Frances Ha.