Usb memory stick not working

I bought a USB memory stick that was working perfectly on multiple computers until my friend took it home to copy some photos and now it doesn't work on any other computer. I though an there was a problem with the USB until I gave her the photos again, but this time on a different USB external hard drive and the same thing has happened. The device isn't even recognised at all, so its not a drive mapping problem.
Could her computer system somehow lock the external devices so that they are no longer functional on any other computer?? How could I fix this??
Thanks!
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