STAMFORD — A Greenwich woman with a history of courtroom antics may face new charges after pushing a judicial marshal during her latest appearance. After getting into a shouting match with a judge and flinging a DVD containing evidence at a prosecutor, Saima Qamar, 48, shoved a marshal while darting out of the Stamford courtroom Wednesday afternoon. Qamar was handcuffed and then complained of feeling faint and was taken to Stamford Hospital. The incident followed a wild hearing that included Qamar cursing at Judge John Blawie.