specfic directory security access when logon is known to others

I have a pc in a peer to peer network that, due to access needs, others know the logon password. however the operator needs one specific directory (and it’s subs) to be accessed by her only (without the constant protection of each file). is there a way other than making two logons? these people have a hard time learning different procedures. AND need access to the user’s email (Outlook 2003)