Sakura Wars: The Movie(2001)

Sakura Taisen: Katsudou Shashin

Like her father before her, Sakura was born to defend her people against the Black Sanctum Council. But her dreams of being a hero take a strange turn when she discovers that in addition to piloting a powerful Mecha, she must also pose as a stage actor! The show must go on – and the city must be saved!

(Source: Crunchyroll)