SBC/ABC/Buffy
Oh, dear Claire. You are adorable. 'Slayering'. Mostly we just call it Slaying. But yes - you are right on the money. Her and I had a mega rivalry.
You could mention something like, she couldn't have killed me without Angelus, was never as strong as me...always wanted to be me so much so that she stole my body. That sort of thing is a sore point. Tell her Angelus would have preferred a vamp Buffy to her.
She also hates that I put her in a coma and stabbed her. (Justified at the time, I swear..)
Now I feel freaking horrible. But, if it helps. Then it's good.