Do the speakers plug in via a stereo headphone port? If she is showing no audio device, she may need to download a device driver for her sound device. Have her try to roll back her device driver, or reinstalling them. Maybe she can be lucky enough that this will do the trick. Other than that, try some control testing. Do headphones work in the jack? If so, it might be the speakers themselves. If headphones do work, try plugging the speakers in a different laptop to see if they work. Good luck..!