Make sure she has a rom from this section
http://forum.ppcgeeks.com/forumdisplay.php?f=99
After that the original download could be corrupt so download it again. If that doesn't work use a different update utility. Download a different rom and just delete the .nbh file on the rom you plan on NOT using. Then just copy and paste the .nbh she plans on using to that folder and try to flash the rom then.