The lioness plays a crucial role in defending the pride territory by patrolling and marking the boundaries with scent markings, which communicate to other animals that the area is already claimed. She also participates in hunting for food to maintain the strength and cohesion of the pride, thereby indirectly contributing to the defense of the territory against potential threats. Additionally, lionesses work together to fend off rival predators or intruders that may try to invade the pride's territory, showing a strong sense of loyalty and cooperation to protect their territory and offspring.