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Basically, what has already been stated. Signing the letter is a way for them to know the invitation to a judicial hearing was received. If she chooses not to go, they can proceed in abstentia. If she doesn't sign it, there isn't a way for them to know, and she'll likely get another one in a month or two. If she never signs a single one, they could proceed without her, but holding a final decision in abeyance until she has the opportunity to tell her side.That last sentence is not always followed by elder bodies, but it's basically what the book says to do.