Then your divorce was never finalized. There is any number of reasons why this could have happened:
1) The paperwork was incorrect,
2) No proposed decree was sent for the Court to sign (the court will not draft its own decree, and requires the parties to submit a "proposed" order for signature),
3) The Court required an oral hearing before signing off on the decree,
4) Or, something else.
The point is, that the divorce was not finished. And if no movement was done on it in about 6 months, it may have been even dismissed.
I do not know whether what the attorney send you is part of the original divorce, or a new action since the original divorce was dismissed.
Regardless, the original petition you filed is likely not enforceable, I am afraid. The only way that it can be is if you and her signed any contract that stipulates what the two of you agree on (NOT the petition, but something else) that would act as a post-nuptial agreement - that would be binding (the divorce would still have to be pushed through, but at least the terms of that contract would then be enforceable).
Otherwise, this may be from scratch.
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