The best thing to do is to contact them and make arrangements.

Not all valid malpractice cases can go forward due to the nature of malpractice litigation and the laws that protect doctors and their insurance...

More information is needed for a good response. Consult with experienced malpractice attorneys in the state where this occurred. Use the Avvo...

Contact them, in writing, negotiate a payment plan. Make sure all agreements are in writing.

Consult with experienced civil litigation attorneys in the state where this occurred. You may have a valid lawsuit.

It is not clear from these facts if she was buying an interest in the property.

Probably not if nothing has occurred for 20 years and they did not sue back then.

Usually, as soon as you are late. Check the contract for specific terms.

Going to jail is unlikely. ———

If she has defaulted in payments you can sue for breach of contract.