What can I do about my stepmother's negligence as power of attorney and executor of my father's will after she is deceased?

My father passed in October of 2017. Prior to passing, my stepmother had power of attorney. My father had 3 biological children including myself. Neither one of us were informed about his condition until a couple days before his death. The morning he passed away, my stepmother instantly blocked all biological children from being involved into everything including funeral arrangements and she would not allow us access into his home. She did not even call us to notify us of his passing. Here's where the negligence comes in.... As executor and while my father was sick and incompacitated, she paid on 2 life insurance policies which she was beneficiary. The were a total of 7, 5 more which included us biological children as beneficiaries THROUGH the SAME insurance company as the life insurance policies which included her as beneficiary. All policies besides hers lapsed. We weren't even aware of the policies until it was too late. She collected on her policies and passed in March of 2018