I'm sorry, but I live in the greater NYC area and your title made me laugh. The VanWyck Expressway is always clogged.
On the serious side, I would hunt down probate information next. She probably had some kind of money to pass down. By the mid 1800s, better records of probate exist in Ontario. Her cause of death probably won't be there, but her date of death would be. Also, check if her husband remarried. That could narrow the field more.