In this case, Natasha and her friends.
Natasha is one of the “owners” of Catherine, who she decides to treat as a “pet” because she reminds her of a cat (hence the name CATherine). Natasha and her friends invite Catherine into the friend group and they all live together, but Catherine is treated badly there and Natasha makes a plan to kill Catherine.
She doesn’t see Catherine as a person, but as an actual animal, a tool, and a nuisance, and wants to badly mistreat her which ends up traumatizing her.
Lawful doesn’t mean “the law”, it means order and hierarchy. Members of a murderous gang would still be lawful evil, because there is a leader and middle management and entry level goons. They all have a role to play and understand that their success as individuals relies on the success of the group.