At some point the ethernet patch cable became unplugged from the back of her CIRC station. This caused the system to lock. In some cases Java enabled web sites can download applets and Java Script to Netscape. This pseudo programming language, if improperly written, can use up all system resources. This will cause at least software lock but possibly OS lock.
Recovery is usually complete and undamaging.
Shutting down and rebooting exterminates many of them.