Hauert won the Ladies European Tour qualifying school in 2003, and in 2004 become the first female golf professional to take a place alongside the men on the Playing Pro Team of the PGA of Germany. In her first three seasons on tour her best finish was a tie for seventh at the Scandinavian TPC hosted by Annika. She gained her first professional victory in a three-way playoff at the 2007 Deutsche Bank Ladies Swiss Open. and her second win at the Finnair Masters. After finishing 2nd at the Wales Ladies Championship of Europe, Hauert qualified for the 2007 Solheim Cup team. Following the 2007 season, she was voted the Ladies European Tour Player's Player of the Year, after finishing a close second to Sophie Gustafson in the Order of Merit.