She said she was around 8 years old at that time :/ Personally, I can't imagine being her sister and Knowing it was her who got him killed, regardless of the whole "it would have happened sooner or later" argument. You never know what would happen. I would have had a VERY hard time forgiving.
Young enough to puke from the sight of sex but old enough to send Anonymous Emails with target names and locations? Idk lol I'm not feeling much sympathy for this instant in her past..