Afterwards, Amanda moves into the Summers' residence, where she trains and becomes friends with her fellow Potentials.
In the final episode of the show, "Chosen", Amanda is activated as a Slayer along with the other Potentials and battles against an army of Turok-Han vampires.
Only Buffy and Oz are aware that Willow's new pet is a transformed human, with Willow referring to her as "Amy-Rat." When Buffy and Willow go off to UC-Sunndyale, Amy-Rat goes with them.
As a result, Willow cuts Amy out of her life entirely.
Amy makes a final television appearance in the Season Seven episode "The Killer in Me" in which she again bewitches Willow, this time to cause her to appear as (and ultimately start to become) Warren Mears.
Willow is unaware of the transformation she accomplished.
In Season Six, after much research, a much more powerful Willow casts a spell and Amy is made human once more.
Amy repays Willow by introducing her to the warlock Rack and abetting Rack in addicting Willow to dark magic.
Later, when Willow decides to give up magic entirely, Amy casts a spell on her, causing her to magically manipulate everything she touches.
Willow complains that Amy's actions are encumbering her attempts to quit magic.
Amy responds by mocking her, implying that she put the hex on Willow as revenge for being trapped in rat form for years because Willow was not assiduous enough in finding a spell to turn her back into a human.
Throughout the episode, the cheerleaders fall victim to evil, disfiguring spells cast by Amy, to disable enough members of the squad to get Amy onto it (including Buffy, whom she attempts to murder).