Found the main character unbareable, she is just awful and not in a redeeming misunderstood way but a delusional, unkind and self centred kind of way. 

While her dad lays dying in a hospice she refuses to visit. 
While her mother reaches out to talk, she is offish only caring about her own feelings. 
When her sister is upset with her because she has acted like a douche she gives her sister the silent treatment. 

I just didn't like her, she just wasn't my cup of tea. 

Books is presented in the format of Fawns emails to the various people she upsets along the way then there is a diary entry. 

In the end she softens but I just by that point had no feelings for her in a positive way and found her to be unbareable.