Headline is a little misleading. She had nothing to do with the release of the Panama Papers. She read them once they were posted online, looking to see if there were people of interest to her community, and blogging about that.
http://www.politico.eu/list/politico-28-class-of-2017-rankin...
> The best way to think of Daphne Caruana Galizia is as a one-woman WikiLeaks, crusading against untransparency and corruption in Malta, an island nation famous for both...“She single-handedly brought the government to the verge of collapse,” says one MP.*
If it were straightforward to report on Malta in the Panama Papers, the original investigation would have targeted Malta's government. A lot of important journalism is examining released material and connecting the dots within a context.