An employee continues to miss work due to a previous job's injury. We have allowed her to attend the chiropractor during work hours but she wants to have unlimited doctor's appointments and have them all excused. We have positions that require state mandated ratios of employees to clients. This is becoming an extreme hardship to the employer and does not seem fair to the other employees. At what point are there too many absences? We have received no doctor's note that indicates she has any disability.

Your company policy is what decides what is too many. Esp chiropractors who almost always have appointments after working hours. But if she starts missing past your company rule, you issue warning and so on.