I am so so sorry to hear about this. I read your thread this morning and it's haunted me all day. I have no idea what I would do in this kind of situation.
You need to expect your sister to scream and yell and maybe say some things she doesn't mean. It's not your fault - accidents happen - but her shock is going to be unimaginable. I'm so sorry you're having to deal with this. I'm going to have you and your sister in my thoughts and prayers.
