Adorable!  I love her summer cut.     
Definitely try having her stand when you put the harness on.  Also do the combing/brushing first.     
Right after my boys have had a bath and their hair hangs right, the hair falls perfectly into place with the harness.  As we get closer to bath day, and I start brushing less out of laziness, then there is a little more poof to deal with.  I force myself to comb out the front end for the harness.     
				__________________  Kristin, Max and Teddy          |