Is it advisable for her to disregard this voice? Are any of its suggestions really of help to her?

Ignoring it is the advice she has been given and is the most important and helpful thing she can do. It is already in her programming to believe carrying out this role, this persona, is of great importance to the well-being of the whole when this is not the case. So paying attention to this voice and carrying out its directions is simply reinforcing that you believe in the need for it and that it is doing something important and worthwhile because you are listening and following its dictates. That is plenty of proof that it is contributing, and that is what it seeks to do even though being misguided fundamentally. The cycle must be broken of cooperation and the unwitting encouragement focusing on this issue brings about.