Maybe. In a Sixth Circuit case, the court ruled that requiring an employee to get psychological counseling could be considered requiring a medical examination under the Americans with Disabilities Act (ADA). The ADA prohibits employers from requiring a medical examination as a condition of employment unless it is shown to be job-related and consistent with business necessity. So long as the employee is still capable of performing her job and does not appear to pose a direct threat to anyone, the supervisor should refrain from requiring her to seek counseling from a mental health professional. However, the supervisor can discuss her inappropriate behavior with her and hold her to the same work standards as other employees.
Source: Kroll v White Lake Ambulance Authority (6thCir 2012) 691 F.3d 809.