Philadelphia ? A woman accused of trolling the Internet as Jihad Jane and agreeing to marry a suspected terrorist and kill a Swedish artist targeted by radical Muslims cooperated with authorities, a congressman said.

Colleen LaRose, 46, pleaded not guilty Thursday to the four-count indictment at a brief arraignment in federal court in Philadelphia. The hearing marked her first public appearance after six months of detention following her unannounced arrest in October. The judge set a May 3 trial date on charges in the indictment, unsealed last week.