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They probably could...of course, a demon behind glass is a lot less threatening than a demon in ur base, killin ur doods.

She sometimes goes by the name Mary Worth, as well. There's probably a similar legend where you're from. Pretty much any urban legend where you have to stand in front of a mirror and say something three times is a pretty good candidate. Candyman is a lame, trivialized version of the myth.

I study demonology or whatever its called. Thats beside the point.
Mary Queen Of Scots (SP?) wasn't into beheading her victims that was her sister Elizabeth I. Mary was killed by her sister (I studied the monarchy as well).
One story goes that Bloody Mary actually came from the the true legend of one of the only vampires to ever be documented. Her name was Elizabeth Bathory or the Countess of Blood. She murdered woman and bathed in their blood because she wanted to stay young forever. She got caught because she killed a noblemans daughter (Virgins). She was put to death.
Yes I did do the Bloody Mary thing. I did it one time with my best friend. She and I were crashing at my house. We went into my bathroom at midnight. Turned out the lights locked the door and lit red candles. We chanted seven times "Bloody Mary I got your baby" we opened our eyes. Nothing. Though it looked like my friend had a bloody nose. It was just the light of the candles reflecting off my friends face. That was a Wednesday night. On Friday exactly at midnight. I woke up. I had a gushing bloody nose. I found out the next day that exactly at mid night my friend woke up and she had a gushing bloody nose as well. Two places the same thing starting at the same time and ending at the same time.
Well we did it again only this time we did it in the garage room. I was holding open an entertainment center glass door open and for no reason at all it just shatters into thousands of little peices. I had a small mirror under the bed/futan were we had slept that night and it had cracked right down the middle, and everytime I would touch it I would end up cut. That night I had had a dream about that mirror cracking and breaking in the same way the mirror was in my woken state. In the dream the mirror had cut an X into my right hand and had slit my friends throat. We have never done it again.
The story about mirrors and the dead is that mirrors suck up the soul of the deceased which will make them haunt the house and family. So they cover the mirrors with a black cloth so that the soul can pass on.

Yes, the Romantic telling of the Lady Bathory's story (my favorite serial killer of all, might I add) pegged her as a vampire.

Needless to say, she had the most beautifu skin in all the land...

twisted

But she still went into history as a vampire. Her body supposedly took elements from the blood to keep her young.

Any person's body will take elements from human blood to keep them looking young if you bathe in it. That's just how it is. But it doesn't mean you're a vampire. It just means you bathed in human blood to make yourself beautiful.

Yes, she went into history as a vampire, but she wasn't a vampire. That's just the actuality of the matter. Vampires drink blood, humans who bathe in the blood of their murdered victims are serial killers with a flair for cosmetology.

twisted

Actually she was a vampire, she didn't have to drink blood to be a vampire. Not all vampires drink blood.