Laura St. DeLions is a character that first appeared in the end of Wanted. Her name is an anagram of Alison DiLaurentis, which leads us to believe it is Ali getting a fresh start in a new town after the incident in the Pocono's. The books's description of her says she has cerulean blue eyes, honey-blonde hair, and having otherbeautiful features. This matches Alison DiLaurentis' description perfectly.
However, in Deadly we find out that Ali suffered lots of burns after the incident in the Pocono's and has got a lot of scars and a rotten front tooth, as well as having lots of chords and veins sticking out of her neck. This means that the beautiful girl described in the end of Wanted is not Ali as we were previously made to believe.