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I suggest using your POA to find out whether your mother's doctors consider her competent before taking any other steps. If you can get a statement of incompetence from her doctors, you do not need to fear any new will because it can be discarded by the probate court following your mother's death when you present the doctor's statement.
I recommend only filing for guardianship if you and your brother cannot agree on your mother's care. If you choose that route, make sure you have a plan for your mother's care to present to the court. When contesting my father's guardianship my brother told the court our father wanted to remain in his home and he wanted to honor our father's wishes and since he was the only child willing to honor our father's wishes Dad had recently made a new will (12 years after being deemed incompetent by doctors) leaving everything to him, disowning his wife and other children. I told the court our father needed 24/7 care which we could not afford to provide for every long in his home; however, if we liquidated our parents assets there would be enough to fund my father's MC care for 10-15 years and enough remaining for 5-8 years of care for my mother too. Dad's heart doctor endorsed MC care and my mother and another brother stated they preferred me as guardian/conservator; the court agreed and granted my petition.