S.B.
um, I don't know what else you could possibly do...short of going into her room and removing the dirty clothes so she can't wear them repeatedly. I remember going through a phase like that too...but not as severe sounding and certainly much younger. Do you think she may be depressed? Could something have happened where she wants to keep people or boys away? Is this a new phase or has she always had poor hygeine?
Good luck. I wish I had an easy solution...I'm at a loss too. I'm sure the counselor can tell she's not taking care of herself...but like you said you can't force her talk about stuff. :(