If after a reboot she is able to run fine and data verification does not show problems I would say don't worry. However, I would check the network adapter on that computer to make sure power management is turned off. While you are at it, check the server and all other workstations as well.

To check, and change power management go to Start – Control Panel – Device Manager.  You will see a list of all the devices on your computer. Click on the plus sign next to Network Adapters to expand the section. Right click on your network adapter and click on Properties.  You should have a power management tab. If there is a box that says “Allow the computer to turn off this device to save power”, make sure it is NOT checked. Then click OK and File – Exit to save your changes.