The worst part is that Abeloth is protected by prophecy. Not just one, but two prophecies. Only a light sider master and dark sider master together can defeat her. She can only be killed by the Blade of Mortis. She has her own private dimension, every force power, shape shifting, and is immortal in every sense. Even if you dump her somewhere else, she has enough power to be considered a Force Nexus, able to use the Force anywhere. The only way to imprision her was on a planet completely surrounded by black holes.
There is a strong argument she has flow walking as a force power. The ability to travel through time and alter events. Her only real counter would be Q, but even then I would say it would be a toss up depending on how the author writes things out. She is that heavy a hitter.
EDIT: Picture