In Atlantic County NJ This is regarding getting paid for being P.O.A. for the past 2 years. Can it be done retroactive? Mom needs money for health.

You are not entitled to a salary for serving as a POA.  If you are providing a specific service, such as doing accoutning work or legal work, you can charge the fees for that service.  However, the duty of a fiduciary is to not engage in self dealing, and you have to be very careful of doing anything that benefits you.