At the University of Illinois (2005-08), Diller garnered her third career All-Big Ten honor after batting .400 with 12 RBIs, five home runs and 17 runs scored in conference play, topping each of those categories among conference third basemen. Diller became the first Illini selected as first-team all-conference since 2004. She also earned second-team accolades in 2007 and third-team in 2005. She finished her career with the Illini ranked No. 2 in school history in runs scored (163), home runs (37) and RBIs (158). She also finished her career fourth in batting average at .314.
Diller was a member of the 2009 NPF Champions, Rockford Thunder.