32 is halfway up the street, so if the media do not actually have her address confirmed it is the obvious place to point to. As far as I'm aware the alleged offender who lived down Wellesley was remanded in prison at the time of LS disappearance. The act that PR is charged with occurred, according to the police, in a "public place" down Wellesley - this is unlikely to be at a front door or involve blood.
I'm not saying it's 15, but it seems utterly bizarre for people to outright state it's 32 when they don't know for sure, there are no definitive images, and crime scene were focused on 15. It's kind of important to know which it is.