AFTER COMPLETING JANITORIAL DUTIES, CONTRACTOR WHITE GLOVE PRO CLEANING SVCS EE LOCKED THE DOORTO THE ADMIN BLD. SHE TURNED QUICKLY, STUBBED HER TOE & FELL TO THE GROUND ON HER RIGHT SIDE. FI RST AID WAS GIVEN UNTIL AMBULANCE ARRIVED. SHE WAS TRANSPORTED TO HOSPITAL FOR TESTS; SHE SUSTAINED 2 FRACTURED RIBS & FRACTURED STERNUM. TREATMENT CONSISTED OF MEDICATION ONLY.