my mom paid off my home, then put a personal lien on the home. can I sell it?

You have the right to sell, but the sale would be subject to the lien, so if the lien is for, for example, $10,000, you will either have to pay the $10,000 at or before the sale, or the title company will insist that at least $10,000 from the sale is held in escrow to ensure that the lien can be paid.  If you dispute that the lien is proper, and your mother refuses to release it, you would have to start a lawsuit to have the lien removed.