Drinking By The Mausoleum Door

Gerard was visiting his grandma's grave. Just a normal routine. Then as he was heading back to his car he saw her. She was covered in blood. Her long black hair was matted in it. She was sat on the mausoleum steps, holding her side and drinking a bottle of vodka. He couldn't just walk away. She needed help.
After a lot of effort on his part, he managed to get her to his home. She doesn't talk, she jumps at every little sound and she was very figitty. Who is she? What happened to her? Gerard will do whatever he has to to find out.