Turn into mist

You need to think. From the look of it Madame Vivante's promise to 'Make Your Fantasy Come True' was more truth in advertising than expected and you are an actual vampire. So what can vampires do? They drink blood. Not helpful. They are supposed to have superhuman strength and speed. You could leap up and smash a hole in the roof. However if this condition lasts for more than a night you might create a way for the sunlight to get in and unless you are a Twilight 'Sparklepire' (and the box of dirt says that's unlikely) that's a bad idea. Think! Wait! Vampires can change into wolves (not a help), bats (better) and mist (perfect!). If your one of those then you could seep into those holes in the walls or between the planks in the roof.

Concentrate! Concentrate! Your body begins to feel cold and light and as you watch you feet and fingers begin to discorporate. You need a few tries to not panic and reform but eventually you are able to calm yourself enough to allow your body to change. Once it reaches your eyes you find that you are blind, yet you can sense the entire room and its contents with some kind of supernatural sense. Now you must decide whether you move out via the holes in the walls of the planks in the roof.