Kotor Campaign guide.
Because Traya has shown the ability to empower others?.....Where? Healing his wounds isn't gonna work because in order for her to do that, she would have to reveal herself. Plus I don't recall her healing someone from being stabbed in the heart, or beheaded something which can happen during the fight.
She wouldn't need to reveal herself.
And perhaps not beheading, but she's healed grevious death wounds before.