She didn't just update to 10.4.11 by any chance did she? It's been showing this kind of behavior disturbingly commonly on a wide range of PPC and Intel Macs [
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Is the restart loop occurring after a Kernel Panic or is it just looping at the startup (bong to white screen). If it's the later it needs to go in for repairs as it's likely a SMC fault of firmware failure.
My advice if it is the former (Kernel Panic-ing) is see if you can boot from the Tiger DVD and run repairs from there, or even an archive and install of a new copy of OS X. If you have an external disk try installing a copy of Tiger (Intel) on that and seeing if that will boot it, and suck the data off that way.
] ]'>Is the restart loop occurring after a Kernel Panic or is it just looping at the startup (bong to white screen). If it's the later it needs to go in for repairs as it's likely a SMC fault of firmware failure.
My advice if it is the former (Kernel Panic-ing) is see if you can boot from the Tiger DVD and run repairs from there, or even an archive and install of a new copy of OS X. If you have an external disk try installing a copy of Tiger (Intel) on that and seeing if that will boot it, and suck the data off that way.