I recall that was confirmed in an earlier chapter (tooshe LITERALLY shrinks!? its not just chibi art!?
With the reveal that she has actual weaknesses based on supernatural myths, her shrinking would make a whole lot of sense.So, she has traditional vampire weaknesses, eh? I will go forward and assume that she would die if a wooden stake was driven through her heart. Then again, most characters in this cast would die from that.
you rarely see mangas using that aspect of vampires but on the time they do, they just delegate it as them being extremely good with fashion and makeup/prostheticsShapeshifting is one of vampires OG powers in myths.