Ok how the hell did she stuff wax dolls ahead of time? She has that tower under her entire control, wiretapping, infiltrated, and who knows what else, if she is not already in there she probably has a secret passage installed too.
What was Usogui's team doing all this time, they felt unprepared in comparison, is like they leave it all to kakerou and just worried on securing the broadcasting system and end it at that.