Marriage records are part of the public domain. They can easily verify this without asking her for any proof. If they do and find our she was lying they will increase the 'charges' against her.
A lot of bad advice on this OP. Your options based on the most optimal to the least optimal: a. Get a lawyer and fight back hard. Now; b. Suffer the consequences with your head held high and both middle fingers in salute of the Dark Lords and their minions - and tell them what Witness My Fury said before they take action; or c. Let whatever they do worry you to the point of breakdown and act passively until it occurs. There is always the chance these elders will leave her alone, but that seems doubtful given what we have heard.
If you are truly out of the Dark Tower forever, you will have to let whatever occurs with family occur. Or play the reinstatement game and then start yet another fade. If you do, learn how to fade appropriately.