You are going to need an local attorney. Your post indicates this will very much be a "fact-based" inquiry and you will need very specific guidance and direction. I suggest you start by reengaging the attorney that you showed the original settlement document.
If they filed a lawsuit against you, then you shouldn't waste any more time posting questions on AVVO. You have a limited time in which to file a meaningful response with the court. Failure to do so could result in them taking a default against you. Make an appointment for a consultation ASAP with a trusts and estates attorney who does litigation work. You can use the AVVO Find a Lawyer search tool to locate one.
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You definitely need to obtain counsel.
The attorney you retain will be in the best position to determine what your rights and remedies are. It is not possible to say anything more without reviewing the trust and the allegations against you.