NEWPORT NEWS, Va. — The mother of the 6-year-old shooter at Richneck Elementary School pleaded guilty Monday to federal gun and marijuana charges. Deja Nicole Taylor, whose son shot 25-year-old Abby Zwerner in her first-grade classroom on Jan. 6, pleaded guilty in Newport News federal court to a felony charge of having a firearm while also possessing marijuana — a drug that’s still illegal at the federal level. Taylor, 25, also pleaded guilty to a felony charge of lying on a federal background check form when she bought the gun, saying she wasn’t a weed user when she really was....