In 2010, Castleman guided the Tigers to its best regular season conference finish in her three seasons. GC was second in the league behind national power Lindsey Wilson. The Tigers advanced back to the tournament finals before losing to the Blue Raiders. She had 12 MSC Academic All-Conference honorees and four NAIA Scholar Athletes.
In 2009, Castleman helped to guide the Tigers to a Mid-South Conference finals appearance against nationally ranked No. 1 Lindsey Wilson College. GC took the Blue Raiders to overtime and then a shootout before losing in penalty kicks, 5-4. The Tigers also received votes for the Top 25 in 2009.