Mary Queen Elizabeth of Scots

Mary Queen of  Scotts was one of my favorite stories we have read because as I read I just wanted to know what was going to happen next. It was very depressing to read about what she went through and how everyone thought that she should give up the crown, and when she asked her cousin queen Elizabeth for help she actually thought that Mary queen of Scotts wanted to assassinate her so she had her locked up. But my question is did she really write those letters or was she just accused of murdering her husband? Honestly I do not think that she seem like the type of person to kill her husband but you never know the world is a crazy place.