As a child Vasílissa was very popular and very kind. That all changed when her father started picking on her. Many people found that she shouted a lot more, and was turning mean.
When she was a teen her Mother got killed by her Father, and her sister Thea killed her father. This saddened her much and turned her mad. After that she didn't have many friends at all, and she got put into a boarding school.
Not much is known about her when she was an adult, as she was taken away after killing her sister's ex-family. All we really know is that she died while in prison.