Just remember, when Hillary goes, she will spend eternity in the Lake of Fire. Life on earth is less time than the snap of a finger compared to eternity. Compared to eternity, it’s not even measurable. So Hillary is escaping justice for such a brief time. So sorry about your sister and the grief you are experiencing.
Even a 14 billion year old universe, and the better scientists say we have another trillion years of dark ages, her punishment should be just a few lifetimes at worse. At least I hope the universe works out that way. Just, but not eternity.