I'm fairly certain she only partially awakened, which was enough to give her the rad outfit.

WAKE ME UP INSIDE

You can't wake up, Mona won't let you.

She had her persona beforehand, it was just really weak. It wasn't until she rebelled against her father that she fully awakened.

WAKE ME UPPPPPPPPPPPPPPP

@-HaruOkamura-
Welcome back, please refrain from killing everyone / kidnapping anyone today please.

Haru deserved more screen time

Basically because plot doesn't need to make sense so don't question it.

HARU PLEASE LOVE ME