If we aren't enemies and we aren't friends then what are we?

Sophie is getting nightmares about what she had done. She can't keep this a secret much longer, she needs to tell somebody but who? Rose isn't a much help, pretending like it never happened. She told Sophie to forget it and move on, but how can she? Meanwhile Katie suspects something is wrong with Sophie, she is determined to find out what it is...but the answer might not be pretty.