It, completely, depends on the facts of your case. Consult with an experienced civil litigation attorney.

Every court and judge are different. Speaking to the department secretary or research attorney may get the information you need.

Unfortunately this is a very common situation these days. Make sure to report to the police and to monitor his credit reports.

The lawsuit is still valid. Make sure you monitor the case to see if they claim they have served you at some point.

If she is a minor, she will need to get an attorney. If she is an adult, her mother does not have control of the funds.

It is possible, but there would be no way to know unless there was a lawsuit.

You need to have the contract reviewed by an experienced debt collection defense attorney.

She cannot get it notarized with your present, legally. You may have to prove the date is wrong.

Contract the contractor's licensing board in your state.

No, it is not likely legal. Consult with a family law attorney right away.