If she enters your room without knocking, consider installing a lock or a door wedge. Explicitly state: "I need privacy in my room; please knock and wait for me to answer."
If you feel safe doing so, talk to your father or mother. Be specific about the incidents you've documented. my pervy stepmom
Modern cinema shows that healthy blended families often require adults to manage their own jealousy and insecurity first. If she enters your room without knocking, consider