Of course it's an assassination. The only paranoid conspiracy stuff comes in when you try to blame the Freemasons/Illuminiati/etc... instead of the powerful and corrupt bank executives that she inconvenienced.
her car... was destroyed by a powerful explosive device which blew the car into several pieces
This has some problems,
1. Passive voice; should be "a bomb destroyed her car"
2. Vague; how powerful exactly was this bomb? did it destroy nearby cars? or only hers?
3. Missing important details; was she in the car? near it?
Call X and call for the favor he owes us or send him 2 more kilos and kill Y. Politicians that protect the criminals can also call in favors...
Princes, Prime Ministers, royal families, mafia bosses, banking execs, spies, ministers...you name it, Panama papers had them. It doesn't take much to kill an average person, they know who to call.
Edit: I think it's important to keep in mind too that Malta has an organized crime presence. In fact it looks like there were three car bombings in Malta last year. http://www.maltatoday.com.mt/news/national/71110/explosion_h...
As a result, Malta has seen a lot of mafia-related violence the last decade [1], with 2013-2016 seeing a record 16 murders, almost all of them unsolved. The violence is crazy considering how tiny the country is, and its urban area is mostly confined to a 10-mile stretch of the east coast.
You have to assume, at this point, that the mafia is tightly intertwined with local politics.
[1] http://www.independent.com.mt/articles/2016-11-01/local-news...
I think we can very safely just drop the term "conspiracy theorist", from now on. There can be very little doubt that "jobs" of this nature are not just approved, but very carefully considered and approved at the highest levels. The questions to be investigated are which organizations were responsible, which individuals were involved and how they operate, exactly.