How old is Abby in the pretty little liars book: unbelievable?

How old is Abby in the pretty little liars book: unbelievable?|||Abby, Emily cousin, is Emily's age, 17. She is party gal but her mother thinks she's sweet.|||Do you mean Alison? If so when they flashback she's around 14. The rest of the girls in the present time are sophomores or juniors so 16-17. Hope this is what you were asking.