Circa 1995, she was a full partner in the law firm Grant, Miller, Conroy, McConnell and Ingersoll. Prior to that she was a district attorney. One of her many cases included a successful prison sentence for the notoriously violent super-criminal known as Demolitia. Darcy was considered a rising star in the firm in that time frame, and she was also engaged to Nick Furst.
Since then, Nick and Darcy have raised two children, both active members of the Furst Family.
Having no super-powers herself leaves her a target of sorts. She does have special communication devices that tie directly into the sophisticated defense technologies developed by Augustus Furst.
It's not known whether she is still practicing law today. At a minimum it is possible that she is involved in legal matters for the Furst Family and its various enterprises.