JACKSON, Wyoming — During her nearly three decades roaming the snowy wilderness of the Teton Range, Grizzly No. 399 became a beloved mama bear with millions of parkgoers following her yearly adventures and her ever-growing family tree. Nature lovers are mourning the matriarch of the world-famous bear family after she was fatally struck by a vehicle Oct. 22 on a highway in western Wyoming. Dozens braved frigid weather in the picturesque ski town of Jackson on Saturday night to attend a candlelight vigil watched by some 1,300 others online. Wildlife guide Bo Weldon told the gathering the communi…