Leela would never lose her desire to fight. If she did, she would not only stop being a warrior, she would stop being Leela. It was a key part of her.

"And yet I will come to your rescue when you need it," she said, "Those who do not think they need help often need it most of all."

Like Narvin. He was too stubborn ever to ask for it, but she was going to save him - save him from herself - if it cost her life to do so.