[It's all her insecurity and bitterness over never being good enough and never being the one chosen and the bone-deep jagged wound that split open the day she found out that there was a universe out there where Adora stayed and that there was just something wrong and lacking with her, specifically, that meant she was not worth it when the same moment came in her history. It's not like that just went away the day she and Sabre started getting along, it just lost its outlet.

And this sword is just really good at pushing those buttons, you know?

So yes, she means it, she wants this gone.]