LS at least, the fact that she killed basically all of her Force-using enemies after her battle with Atris. We know she gets stronger by absorbing the Force energy of her victims, and with the exception of some paltry Sith assassins and two Sith Lords on Onderon, she hasn't even killed a Force user up to then.
By contrast, she absorbs the energies of a Sith army on Citadel Station, hordes of Sith on the Ravager, a legion of the strongest Sith on Malachor, and arguably Darth Sion as well. That all comes after her fight with Atris.