“The looks she gives throughout the season make her seem dead inside. When she took Cassandra’s medicine, she waited a weird amount of time to go get it and didn’t seem concerned her sister was dying. She’s always detached from things she does, like how easy it was for her to just pick up the gun and shoot Dewey when everyone else was shaking over it. She might’ve spent a lot of time with Campbell as a kid while her sister was in the hospital. Since she was ignored while everyone cared about her sister in her developmental years, she might’ve developed traits that caused her to be off emotionally.” —u/ber485