LONG BEACH, Calif.—After more than 31 hours of searching for a woman who went overboard on a Carnival cruise ship near Ensenada, Mexico, the U.S. Coast Guard said Dec. 12 it was standing down pending additional information. The passenger, who was in her 20s, was reported overboard from the balcony of her stateroom aboard the Carnival Miracle at about 3:30 a.m. Saturday, according to Coast Guard Petty Officer Adam Stanton. The Coast Guard conducted first light searches Sunday morning with “negative results,” authorities tweeted at 10:36 a.m. Coast Guard assets were moving back to U.S. waters. The Carnival cruise ship returned to Long Beach on Sunday morning. “We advised Carnival Miracle guests this morning of an overboard incident involving one of our guests from the balcony of her stateroom,” Carnival said in a statement Saturday. “After assisting the U.S Coast Guard with a search, the ship has been released and …