The student had been briefed to carry out a series of solo circuits and landings. The instructor observed the first circuit, and reported that it appeared to be normal. On touchdown, the aircraft bounced then pitched nose down. The subsequent touchdown was heavy and the nosegear was torn off. The student had accumulated 1.5 hours of solo operations on 4 previous flights, and had received a dual check on her last flight, which was 8 days prior to the accident. When the aircraft bounced she had evidently been unable to take suitable corrective action to prevent the subsequent heavy touchdown.