You need to retain an attorney to help you with this. You have ZERO chance on your own. Best of luck.
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This is a matter to be addressed by the probate court. You need a lawyer if you wish to challenge the guardianship. There is nothing that can be done in this simple Q&A forum to help you.
There were two court cases going on: 1) in divorce court, and 2) in probate court. Your husband's death abated the divorce action, but the probate court was free to carry on. You're wrong when you say "The divorce did not survive so the guardianship cannot be maintained?"
Then you ask "what must be done?" "Where do I go?" "Do what?" The answer is the same: hire an attorney.
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