Why did you assume she should be covered more by the media (beyond the current level of coverage)? Many (even religous people) don't accept the Fatima visions and she was not a public figure like Mother Teresa.
Because there has been renewed discussion of religion in mainstream media. There was a movie about the visions at Fatima. And it's a little more important than the death of rapper "Old Dirty B******," someone I'd never heard of.