You need to consult with an experienced immigration attorney who should review the grounds for denial as they are determinative for what can and must be done to remove the condition on your residence.
Your mother's divorce does not mean she can't file for her own I-751 petition based on a waiver. You should also be able to have this option- please schedule a consult with a local and competent attorney in your area who specializes in immigration and removal to fully determine your rights.
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