nora newhouse

How are HR Benefits Specialists handling the following scenario:  
Employer A employed employee # 222; employee # 222 after two years decides to change to a per diem status/as needed basis . 
Employee #222 was FT during the 2014 calendar year.  Does this mean that for this particular employee, Employer A has to offer employee #222 medical insurance per ACA?
In addition the following is also important  information to know the following for employee #222.
Employee #222, took a FT position elsewhere; the 2nd Employer B offered benefits to employee.  Also, employee #222 is being covered  by her spouses' insurance benefits. 
To avoid any potential penalties Employer A offer insurance to employee #222.   
  This means employee #222 has triple coverage.  Does anyone out there know if ACA has address this particular situation? And/or does an employer have to provide coverage if the employee has insurance elsewhere? 
I know, this is very confusing and complicated situation.
Thanks
HR Rocks