If it is credit card debt, the lien is invalid, but if you or your mother ignored a complaint about the debt and failed to object to the lien, you may have to do something about it in the court that granted the lien. If you live in a state where a credit card lien can be obtained without a court order, you will have to take some other legal action. If you fail to have the lien removed, it will come back to haunt you if you want to refinance or sell the property, or if you die.