You may be on the hook and have to sue the other borrower. You may want to hire an attorney to review the documents and facts.

You can do so if she agrees. You cannot sue her now unless she is in violation of the oral agreements.

Have a conservator or guardian appointed for your mom to initiate a lawsuit.

Contact the DEPARTMENT OF SAVINGS AND MORTGAGE LENDING https://www.sml.texas.gov

You may have to sue. Make sure you do so before the time limit to sue for oral agreements runs.

Seek another attorney to revoke the settlement. If it cannot be revoked, you may have a legal malpractice lawsuit.

If you do not agree with the settlement, and your attorney is not taking care of it for you, consult with other attorneys to see if they will...

What is being asked is unclear. Please repost question.

No. Liens attach to the property the debtor owns only.

She will not face jail time. The only time that could happen is if there was a court order to appear and she does not do so.