From the text you wrote, it seems that it stopped running while your wife was operating it. At that point, she tried to re-start it without success. Does it turn over? If it does, look to the ignition, if not; does the starter get voltage while trying it? If it does and the engine won't turn over the engine might be siezed. If it doesn't look to the relay. Is there voltage going to the relay but not going through during start up, then it's a relay. Your volt meter is always your best friend.