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You can file a petition challenging husband's guardianship and asking that he be replaced for failing to carry out his duties in the wards best interest. When you have initI ate the action in court you will be able to utilize discovery to have access to medical records to review his decision-making regarding her care. Absent filing a petition to obtain court authority for records you will not have access to her medical information. The medical providers simply will not be authorized to release it to you.
I hope this information and advice is helpful and I wish you the best of luck with these difficult circumstances.