I suspect she was investigating something related to a gang/Mafia because intelligence services will always keep their hands clean. Hence deaths looks like natural causes. Bombing the car however sends a message to whom ever she was working with.
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You may be correct about the mafia as the Guardian article mentioned she has investigated the mafia in Malta.
However, I really doubt that intelligence agencies 'always keep their hands clean'.
Just as an example: The CIA Drone Program
Spy agencies (intelligence service is their own euphemism) also send messages.