Thank you for your question.
Unfortunately, if she can prove that she appropriately listed you as a creditor, provided notice, and your interest was discharged by the bankruptcy court, she may be able to successfully defend against your lawsuit.
If a creditor attempts collection efforts on a discharged debt, the debtor can file a motion with the court, reporting the action and asking that the case be reopened to address the matter. The bankruptcy court will often do so to ensure that the discharge is not violated. The discharge constitutes a permanent statutory injunction prohibiting creditors from taking any action, including the filing of a lawsuit, designed to collect a discharged debt. Keep in mind that a creditor can be sanctioned by the court for violating the discharge injunction. The normal sanction for violating the discharge injunction is civil contempt, which is often punishable by a fine.
So, depending on what this is worth to you, you may not want to risk being sanctioned for attempting to collect the debt if it was appropriately discharged and you have no way of proving that you did not receive the appropriate notice.
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