Did your friend run the Microsoft Compatibility Test prior to attempting the W10 upgrade? If not, and her computer wasn't healthy prior to the upgrade, this most likely accounted for the error. Faulty drivers or a failed RAM stick or hard drive can also cause these kinds of errors to occur.
You might consider asking your friend to take the laptop into her local repair shop where they employ licensed Computer Techs (A+), and pay them to do the upgrade for her.
Best of luck,
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