If you share an internet connection
they're networked.
And they both talk TCP/IP, so if you can find a PC print driver for her printer, you should be able to print to it.
I can't help you with the Mac. I know nothing about them.
(
Syncubus Yarr! Ye'll be walking Planck's Constant! [GMT-5],
Mon 11 Dec 2006, 13:22,
archived)