Pretty sure Luke was giving her power. After the fight: "Jaina experienced an abrupt draining as her Force energies returned to their normal level."
During the fight she mentions this:
"Despite the ringing in her ears and the gauze in her head-despite her hugely aching skull and the big knot of hurt swelling on her brow-Jaina had never been so filled with the Force. She could feel it in every cell of her body, swirling through her like fire, burning more ferociously every moment. She had never felt so strong or so quick or so alert. She could drive her fist through a durasteel wall, or catch a blaster bolt between her fingers. Despite the red curtain of blood cascading from the gash where Vatok's helmet had split her forehead, she was aware of everything."
So either it was an amp of a semi state of oneness.