Well I've heard some stories that she was a princess, and she kinnda went mad, and started killing girls form the ages 11-25, that's all I really remember but, there's some info on a story. You could look her up on google.
Mary I (18 February 1516 17 November 1558), was Queen of England and Queen of Ireland from 19 July 1553 until her death. The fourth crowned monarch of the Tudor dynasty, she is remembered for restoring England to Roman Catholicism after succeeding her short-lived half brother, Edward VI, to the English throne. In the process, she had almost 300 religious dissenters burned at the stake in the Marian Persecutions, earning her the sobriquet of "Bloody Mary". Her re-establishment of Roman Catholicism was reversed by her successor and half-sister, Elizabeth I.
I found this The legend of it here in Jackson, Michigan goes like this: A long time ago there was a little girl named Mary. She must have gotten in an accident because she went into a coma. At this time doctors didn't know what a coma was, so they thought she was dead. They buried her alive! Every night Mary's mother thought that she heard a scream coming from Mary's grave, but no one believed her.
Finally one day Mary's mother convinced them to dig up her grave. When they did, they found scratches on the top of the coffin and Mary's fingernails were all bloody. There are many different things that I have heard that will happen when you say "Bloody Mary" in the mirror. The most popular one here is that you will see Mary in the mirror walking down a case of stairs. She may be holding a knife. If she is, you must turn on the lights or she'll kill you. Also she could be holding a rose or teddy bear, and then she won't kill you.
Mary's "so called" grave is also here in Jackson. I have been to it. It's out in the woods and you have to walk through a lot of trails to get there. When you finally do, you have to walk up a big hill and there is a big tombstone on top that just says Mary. There are also other tombstones, too. Mary's grave was removed recently because the coffins were beginning to stick out of the ground.
We used to say " bloody mary I killed your baby ". Though that doesn't fit in with your urban legend, I was in catholic school at the time and the theory was that a distorted pissed off face of the virgin mary would haunt you for killing jesus.
Bloody Mary (the drink) doesn't sound so good. I hate tomatoes. And I don't think the girl who bathed in blood (if you mean the one I'm thinking of) was named Mary. Are you referring to the lady who bathed in the blood of virgins under the belief that by doing so she would be immortal or have eternal youth?