Immediately, it sounds like a virus, though if it is I couldn't tell you which one.
However, it also sounds like the laptop could be overheating, or it could be a hardware problem. I've seen problems like that from overheating that were fixed by simply allowing airspace under the laptop. I can't guarantee that's the problem, but it's worth a shot.
If it's hardware, I'm leaning towards a RAM problem. She can download memtest86 and run that to see if there are any corrupt sectors on her RAM. One bad sector can cause random shutdowns and BSODs.
If possible, I think the easiest fix would be to format the machine. Backup everything necessary and do a fresh install of Windows, including a complete wipe of the hard drive. That way, if it is a virus, you know it's taken care of. And you can also very quickly figure out if it's not a virus. If formatting is not possible for whatever reason, then try troubleshooting the hardware.
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