If the friend was not working at the time--so, for example, her workday had ended and she was headed for her car to go home--then she would not be eligible for Worker's Compensation; Worker's Compensation is not insurance for injuries occuring at the employer's location, but rather comensation for injuries incurred in the course of work.However, if she cannot file a Worker's Compensation claim, she may be able to sue: property owners have an obligation to maintain their property in a reasonably safe manner. If the parking lot's owner (either the employer or the landlord, for example) has allowed the parking lot to get into disrepair and its due to that disrepair that your friend fell, she may be able to sue that person or business. Of course, since you can only sue to recover medical costs, lost wages, out-of-pocket expenses related to the injury, and "pain and suffering" for serious injuries, if she was not hurt or only slight hurt, it would not be worthwhile to sue.