Before the waves started the queen was involved in diplomacy, Melromarc's domestic affairs were also excellent, and she left the country to the one she trusted as her right-hand man. But, he died during the wave. Damages from the wave were reported all over the world, there was a world conference and every country was represented by their king or queen. Of course there were countries that on bad terms with each other, Melromarc and Silt Welt for example. There was a prophecy that stated the world was facing its end, so their hostilities were put on hold, until the conference was complete. During the conference, it was decided the Melromarc was fourth in line to perform the summoning.
It seems the Three Heroes Church took advantage of the queen's absence, to summon the Four Holy Heroes. That lead to a lot of criticism from other countries, it was the problem the queen was taking care of that lead to her delayed absence. She permanently deprived Trash and Bitch of the authority of the imperial family, as punishment for their evil deeds.