cook has been competing in the british women's trials championship class since 2004 and won the championship in her first year. this started a six-year run of championship wins until she finished runner-up to gas gas rider joanne coles in 2010. in 2011 cook was back to her winning ways, repeating in 2012 and 2013 until she was beaten in 2014 by current women's world champion emma bristow. on the world scene she was runner-up in 2008, 2009 and 2010 to laia sanz and then again to emma bristow in 2014.