If she is giving readers what she thinks they want instead of what she is, she should stop typing. But if her books reflect her character, who she really is, then she is giving them a new and wonderful gift. Giving it to herself, too. And that is true of music and art and teaching and medicine. They don't make good lawyers, either, or doctors or businesswomen.
Imitations are redundant.
Yourself is what is wanted. You already know this. I just need to remind you. Think back to first or second grade, when you could still hear the sound of your own voice in your head, when you were too young, too unformed, too fantastic to understand that you were supposed to take on the protective coloration of the expectations of those around you. Many a woman, too.