As a matter of law, a confession by itself can not support a conviction, and why you see so many defendants confess to a crime, only to go on to plead not guilty at their first appearance.
By entering a NG plea, this gives their defense attorney the opportunity to investigate their case, and explore their possible defenses..
And this is exactly what happened here: Following her arrest, TA provided LE a recorded statement that she was responsible for the deaths of the victims.
However, at the first appearance, the Court entered NG pleas for not only TA -- but for each of the defendants, and also ordered each defendant be appointed counsel.
Not withstanding TA's alleged affiliation with Sovereign Citizens Movement, she was also the first to lawyer up with not one but three defense lawyers-- long before her co-defendants requested counsel.
As of this date, I've seen anything to support TA intends to change her plea to Guilty. In fact, quite the opposite. IMO, her attorneys are probably engaged in studying how to suppress her confession to LE from being admitted as evidence in her trial, supporting her involvement in the subject murders.
In fact, I don't think the subject of "Sovereign Citizen" will ever enter this trial-- or not by way of any named co-defendants here. This isn't an income or property tax protest-- they are fighting for their lives.
Specific to TA alone, not long ago, she was a licensed process server who was engaged in ensuring that legal documentation arrived at the correct person, and recorded the delivery following the specific local, state and federal laws.
It doesn't follow that a true (sovereign citizen) believer would take part in delivering documents to people named in legal action, or use the OK Court system to fight her son and his former girl friend, for custody of their own children. Nope...just the opposite, given it seems to me that TA has invested a good chunk of coin utilizing the US Court system to both fight against and impose legal action against others. MOO