STEPPED IN MUD AND SLIPPED FELL TO KNEES. DID NOT REALIZED THAT SHE HAD HURT HER BACK TIL THE FOLLOWING SUNDAY 1-2-03 SHE WAS AT WORK MONDAY 1-13-02 SHE WAS OFF TUESDAY AND WEDNESDAY. BUT DID COME IN ON WEDNESDAY 1-15-02 LONG ENOUGH TO REPORT THE INJURY TO ME. I WAS NOT IN THE OFFICE SO SHE REPORTED IT BY PHONE. SHE SAID SHE HAD PULLED SOME LOWER BACK MUSCLES.