A woman who alleges Groupon Inc. used her identity without her permission will have to go it alone in her lawsuit against the deal-of-the-day website, a federal judge held Monday. In a written opinion, U.S. District Judge Ronald A. Guzman denied Christine Dancel’s motion to certify a class in the suit she filed under the Illinois Right to Publicity Act. Guzman held Dancel’s proposed class and subclass did not meet all the …