By Simon Jennings YANQING, China (Reuters) -Defending Olympic champion Mikaela Shiffrin crashed out of the women’s giant slalom on her first run at the Winter Games while Swede Sara Hector took top spot after taming the ‘Ice River’ course on a dramatic Monday at the Yanqing Alpine Centre. American Shiffrin, who came out seventh, was not injured as her skis slid out from under her as she pushed into the turns coming down, causing her to miss a gate. She got back on her skis and made her way slowly down the rest of the course. Hector, who leads the World Cup rankings in giant slalom this season,…