I don't see anything in PCAnywhere's literature (I use VNC for remote control) about printing to the controlling computer. Either it's poorly documented, or there's another process involved here.
Once she has remote control by way of PCAnywhere, what application is she using on your pc to log into the AIX application? A terminal emulator? or some sort of Windows based client?
If the former, I'd suspect there's either an LPD daemon running on her PC and you need to set up a queue to print to it, or there was Samba-ness involved.
If the latter, Samba's the prime suspect, since the printing could quite possibly be originating from your pc instead of the AIX box.
Rod Knowlton
IBM Certified Advanced Technical Expert pSeries and AIX 5L