Which answers listed below would be most likely the cause of the issue in the case:
In the past, a customer has had no problems connecting the wireless network on your network, but recently she moved to a new company. After moving, she cannot connect to the network.

An AP has a limited distance that it can direct data transmissions. When a customer system moves out of range, it cannot connect to the AP. Many strategies exist to rise transfer distances, including RF repeaters, amplifiers, and buying more powerful antennas or wireless APs. The issue is not likely related to the SSID or broadcast settings, as the customer had a connection to the network before, and no settings were changed.