She still lies awake, even after her parents fell asleep while drowning their sorrows in a bottle of whiskey.
Aliana only finds comfort in two things. One: that now her sister is free.
And two: she has fulfilled her promise to her beloved sister,
"Go into my room, take my phone and my journals, and get to know the real me. Promise me that when the time comes, you will know the me I always hid."
That was the only thing her sister ever made her promise.