Maybe she'll be super girly for the rest of her life. OK, well that's what she's comfortable with. It doesn't fit your tastes but she's not your fucking twin. Have some boundaries, OK?
Maybe she'll head for something more "in the middle" and express gender in a way that isn't hard on the high femme side of the binary. That's fine too.
Maybe she'll figure out that she likes a more "butch" appearance. That's also fine.
But to get to those end points, it takes experimentation. It takes time.