iPhoto modifies the files and hides away the data to some internal location (at least it used to, it may not any more). Once you import,you can no longer directly access your files in the filesystem (they're all 0 bytes). Of course, she may have done something to cause this, butall she knows she did was upgrade it.
iPhoto has always saved the files as standard files. It has also always made a copy of the file and then only saved modifications to the second, leaving the original pristine.
What's cool about Aperture (Apple's professional photo management application), is that it does not make a copy. It instead stores all of the edits/changes as a mathematical entry in a database, giving you the same safety of pristine digital negatives, but not the store bulk of multiple files.
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