"Britney, I love you so much. Come up on stage with me."
"Katy, stay in the audience and watch."
Madonna and Britney are friends, have performed together and even collaborated. Why should she give Katy the same option when they barely know eachother?
I took it as if she saw Katy Perry front row she would kill herself
She's saying that if she were in the front row and saw that (the show/performance) she would kill herself, but anyway she's not shading anyone, it's just bad timing