She is not your competition. She is your sister. Support her professionally through positive feedback, encouragement, teaching what you have learned, providing tips on professional polish, communication skills, and navigating office politics. You are an example and you have tremendous power. Use your super powers consciously and wisely as the incredible tools that they are. Empower your sister so that she can empower others. Be the example.
Life Coaching by GailD. Book a session at https://mymentor.life/gaildhoward