My best friend is super jealous of me?

My BFF and me are going to be scene. She is really mad and jealous of me because im "more scene then her" and im "prettier and skinnier" I told her shes pretty and she wont listen!!! She thinks shes fat, ugly, has dry skin, acne, her cover up wont work, her face is red, and then she goes and tells me "I should have just been scene alone." I really need your guys help. She wont stop until its fair. I'm afraid this is going to ruin our friendship. And i dont not want to be scene. No matter what I say she just pulls up another reason. I told her it doesn't matter whos prettier and then she said i think shes ugly. Please help, i need to convince her not to be jealous of me. BTW She is very stubborn, insecure, and can be very very hurtful. So please a easy VERY VERY VERY nice way of convincing her.