An airline transport pilot was receiving instruction in tail wheel landings in her personal airplane (she had been flying it on floats in Alaska for the last five years). The flight instructor said this was the first tail wheel landing for the day, and it was the second day of their recurrent training. The student said that after she landed, she released pressure on the flight controls like she did during a float-airplane landing on water. During the landing roll, the airplane ground looped to the left, and a rib and spar in the right wing were bent.