Open the file explorer and go here: "{old drive letter}\Documents and Settings\{username}\Application Data\Mozilla\Firefox\Profiles" and look for a folder titled "default". You'll need to supply the values inside the parenthesis, of course. Poke around in there and look for a file titled places.sqlite. Once you find it, copy it to the exact same location on the C: drive into her new profile (remember her username might be different now).
..What HE said. LOL All I know is the ‘show all bookmarks’ then ‘backup’. But I think what HE said will work.