Louise event's are connected to the dialogs with Elina, who stands in the throne room at first, and then moves to the noble living quarters.
You're probably missing her events before you can advance the story of Vampire.
Can you post your save? It's faster if I check what step you're missing directly in the file, than to ask about every possibilitiy. :D You can find the saves in the www/save folder. I only need the file with the save slot number which you want me to check.
