The flight was a check for the pilot-under-instruction who had not flown since gaining a restricted private licence more than three months previously. This was also her first flight in a high-winged aeroplane. After some general handling practice, the instructor initiated a practice forced landing which was to conclude with a full stop landing on an authorised landing area (ALA). The pilot-under-instruction flew the aircraft with the instructor commenting as necessary. On late final, with full flap selected, the aircraft developed a higher than normal sink rate and subsequently contacted the ground in a right skid. This subjected the nosewheel leg to substantial sideloads, forcing it to the rear left and buckling the firewall. Late in the landing roll, the propeller and right wingtip contacted the ground. The instructor reported that he was aware of the high sink rate and placed his hands on the controls but felt that no control input was necessary as he had experienced landings from similar rates of descent many times. Had the aircraft been in balanced flight at touchdown, it is possible that no damage would have been sustained. Neither crew member reported hearing the stall warning operate. Conditions were such that the higher sink rate could have been induced by windshear.