My Best Friend

This is my friend, she is always with me. She is very pretty, much prettier than me.
When she goes away she comes back with a different name. I dont know what her name is anymore
I used to call her Olivia
She walks to school with me, holding my hand. She talks to me, and sometimes she screams. She says my happy will come back and the pain and sad will go away if i scratch.
She said I can be pretty just like her if my scratches are on my eyes instead of on my arms and chest
I want to be pretty like her