From the wiki:
In 2186, Emily Wong reported for FCC News and the Alliance News Network from Earth on the Sol system's mysterious comm buoy outage. She was able to establish off-world communications via a Quantum Entanglement Communicator. While reporting, she witnessed a Reaper descend through Earth's atmosphere into airspace over Los Angeles.
She eventually arrives at El Monte Airport, where she meets some members of the National Guard who are attempting to hold off the Reapers with anti-aircraft guns. The National Guard and their air support lead a counter-attack which is ultimately ineffective.
Wong ponders that the signal she is broadcasting led the Reaper forces to that location. In an attempt to escape in a sky van, Wong is attacked and injured as the Alliance forces and airport are destroyed. Without any weapons left and having lost a lot of blood, she pilots her sky van into the approaching Reaper and her signal is lost.
"Fighter drones closing. Gunships are down. Mom, dad, love you"
"Go on. Make your noise. Try to scare us."
"You want to see how a human dies? At ramming speed"
-Emily Wong's last transmission
As of now she is considered MIA.