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It could be the brand of CD blank.
The old CD-Rom in the 5500 may be very sensitive to the newer fast-burned CDRs and it just doesn't like the Samsung?
I'll buy a different brand and try again. I don't know at what speed the TDK was burnt, but it was also a 48x CD-R media.
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Assuming that the drive is an Apple original and running on Apple drivers?
Yes. Both.
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Or, shot in the dark here, is File Exchange extension activated on her system?
The extension is definitely activated. I didn't touch the extensions after the installation and I am 99.9% sure she didn't either.