Alison's Horror Story

In The First Secret, Alsion told a horror story to a kid that Hanna was babysitting.

Story
Alison's story was about a little girl and her twin sister playing with dolls. There's a doll that they fight over and Alice's sister gets it first, but Alice also wanted it. Angry about this, Alice gets up and walks to a drawer. She opens it and grabs the knife inside of it. She stabbed her sister in her heart. Their parents come home afterward. Alice gave a sly smile at them while she watched the blood ooze out of her sister. They sent her to asslyum.

Hints
Alison's story is similar to her feud with her own twin, Courtney, in the books. This is a hint that Courtney may appear in the show.