IIRC, it wasn’t that “she liked lipstick and dudes” but essentially that her thoughts of Narnia became “oh, that funny game we played as kids”.

It’s not her gender or orientation, it’s that she lost her belief in an effort to become more “adult”. The lipstick and boys bit is more to emphasize this.

Narnia is apparently like Neverland in this regard. You stop believing and the magic is gone.