The differences between 10.4 and 8 are much more than 9.2.2 and 10.2.8. The following gives some idea of the disparity between OS versions. You probably will have compatible AFPs in her Macs.
QUOTE
Mac OS 8, Mac OS 9, and Mac OS X 10.1 to 10.3.9 support file sharing (AFP) connections over AppleTalk. However, Mac OS X versions 10.0 to 10.0.4 (more) and 10.4 and later (more) can only connect to AppleShare over TCP/IP.
If you want to connect from versions 10.1 to 10.3.9 to Mac OS 8 sharing (which is AppleTalk only), be sure to enable AppleTalk as described in steps 5 and 6 in Section II, above. Mac OS 9 and Mac OS X can both connect over TCP/IP without AppleTalk, so this step is optional in the absence of Mac OS 8.
Mac OS X 10.4 and later don't support Personal File Sharing (or other AFP) over Appletalk, though by initiating the connection from the opposite direction you could still achieve an IP connection from a Mac OS 8 computer to a sharing Mac OS X computer. The Network preference pane in Mac OS X 10.4 and later still offers the AppleTalk checkbox, but it is for browsing AppleTalk-advertised resources and zones. The subsequent connection must be over TCP/IP.
http://docs.info.apple.com/article.html?artnum=106461