I haven't seen it but didn't Leanna get given a backpack of Meena's? Guessing there was something inside and Leanna saw it.
Either way pretty crap death, won't have any impact on the show at all - the actor playing her dad will be less of a bad comedy act for a while and things will return to normal and Leanna had promise to become a good character.
There is so much dead wood on the show and they kill off a character just starting to become relevant.