On June 23, 2001, approximately 2015 central daylight time, a Balloon Works Firefly 8B-15 hot air balloon, N72524, was not damaged during a hard landing near Celina, Texas. The commercial pilot was not injured, and the student pilot received serious injuries. The balloon was owned and operated by the student pilot. Visual meteorological conditions prevailed and a flight plan was not filed for the 14 Code of Federal Regulations Part 91 instructional flight. The flight departed McKinney, Texas, approximately 1900. The instructor and student pilot stated that during the instructional flight, the instructor had demonstrated several approaches and landings. During a landing to an upward sloping terraced hill, the balloon bounced on one of the terraces, and the student pilot was "thrown forward." The student pilot had lost her footing, one of her shoes became lodged in the bottom of the basket, and she sustained a broken ankle. The instructor aborted the landing, and landed at the next available field.