 Complete the following phrase:  Spiegelburg reached the final at the 2006 IAAF World Indoor Championships and went on to finish sixth in the pole vault final at the 2006 European Athletics Championships in Gothenburg. She twice achieved marks of 4.56 m on the European circuit that season and came sixth at the end of year 2006 IAAF World Athletics Final. In 2007, she improved her indoor best to 4.50 m and came fifth at the 