She was upset that her best friend of 6 years didn't write her once while she was in there (my sister had written her 9 letters). When she got back to my parents' house today, she posted a comment in her friend's LJ saying she was mad because she hadn't written back. Her friend deleted the entry, de-friended her, set posting to friends only and then made a semi-cryptic non-specific post saying "Glad you're back. Chill out and get lost."
My sister is devestated. I want to strangle the bitch.