Rhines qualified for the 2008 Olympic Games by placing second in the 5000 meters at the U.S. Olympic Trials. She finished 14th in the 5000m Beijing final with a time of 16:34.63. Rhines won the 2011 USA Half marathon title, with a time of 1:11:14 in Houston, TX. Jen is coached by her husband Terrence Mahon.