Chapter 2 gets right into showing how powerful Darth Amorosa is when she trounces Kylo Ren in a lightsaber duel.
There's a bit of Fridge Brilliance here as well, as Aliana comments on Kylo's lack of skill with a lightsaber. Considering her family has been a consistent presence in the galaxy for thousands of years, it's likely that Aliana has more advanced lightsaber training than Kylo could have ever gotten from Luke.
Chapter 17 confirmed this to be true, as Aliana fights with the Juyo form while Kylo Ren uses the most basic of lightsaber forms.
Chapter 3 has Amorosa not only wipe out an entire Stormtrooper platoon, but ensure every scavenger escapes on transports before Niima Outpoust is bombed into molten slag.
In Chapter 5, Amorosa doesn't want to risk blowing her cover when Kylo Ren boards her ship. So instead of drawing her lightsaber, she takes him on with her bare hands. She manages to disarm him and almost kill him through strangulation before he uses the Force to attack Rey and distract Amorosa long enough to make her escape.
Chapter 9 has two major moments.
Rey completely overpowers Kylo Ren in a fight by using Force Rage, and is even looking forward to killing him before the planet splits apart and she has to escape.
Aliana has the mother of all CMOAs when she uses the Force to stop the Starkiller weapon's laser in the middle of it's firing sequence. She can only hold it for a few seconds and needs an 18 hour rest afterward, but it's just long enough for Poe to destroy the base.
Chapter 16 and 17 have Rey and Holdo respectively rake Leia over the coals for her obscene bias against Aliana when compared to how desperate she is to turn Kylo Ren back to the light. Both highlight the fact that Kylo Ren is a murderer while Aliana has been nothing but helpful since she showed up on their radar. Leia is stubborn, but does eventually relent when she sees the impact her words have had on the Sith.
In Chapter 20, Rey defeats Kylo Ren in another lightsaber duel. This time her advanced training from Aliana proves to be an asset and she even uses Force Lightning to further humiliate Kylo before throwing him back on his ship and sending him out into space with a message to his Master.
Chapter 21 continues the trend of Rey being extremely powerful by having her take out not only Snoke, but two fully trained Knights of Ren on her own.
◊ à la Sylvanas Windrunner, her eyes colored yellow by the Dark Side. Cue Curb-Stomp Battle.
