Notwithstanding any general or special law to the contrary, Susan Rathbun, the Chief of Police in the Town of Hinsdale, who would be subject to mandatory retirement on the last day of the month in which she turns 65 years old, may continue to serve in such a position until February 2, 2027, or until the date of her retirement or non-reappointment, or the date she is relieved of her duties by the Town, whichever occurs first; provided however, that no deductions shall be made from the regular compensation of Susan Rathbun pursuant to Chapter 32 of the General Laws for any service subsequent to her reaching the age of 65 in connection with her service to the Town for retirement purposes; provided further, that she is mentally and physically capable of performing the duties of her office; provided further, that the Town may at its own expense require that Susan Rathbun be examined by an impartial physician designated by the Town to determine such capability; and provided further, that Susan Rathbun shall, upon retirement, receive a superannuation retirement allowance equal to that which she would have been entitled had she retired at the age of 65.