What is known today is that the aircraft appears to have planned to make the flight using up its reserves of fuel.
On descent to Medellin, an A320 from Panama declared a fuel emergency due to a fuel leak and all traffic was vectored or put on holding patterns to give the A320 priority.
The RJ never declared an emergency until its last circuit when it said it had an electric failure, left the hold and tracked direct for the field and crashed shortly after.
The 3rd "crew" person was a private pilot, normally a flight attendant, daughter of a well known journalist in Bolivia and also a part time model, but not rated on the aircraft.