You still have attorney client privileges...that is absolutely true.
But that only means that she can not discuss your case with anyone but you.
That does not mean she has to help you
In fact, the opposite is true.
Once you left the service, she no longer has a duty to assist you
After 13 years, it may be she is no longer in...or if she is, no longer working as a defense counsel.
It is likely she no longer has the file (there is no duty to keep files after discharge)
So you can try and track her down...but it is not likely going to do you any good...since she is not required to assist you and, frankly, likely no longer has the file after over 10 years'
If the goal is to appeal this, you are a bit late.
There is a 3 year window to appeal to the board of corrections for military records.
You can apply and ask them to waive the 3 year window...if you can show good cause for waiting so long, they may agree to look at your appeal even though over 3 years have passed.
I would considering hiring a lawyer with experience in this area...even if you can track down this JAG officer
, I would not expect them to assist you, since they are not required to do so, and could not do so ethically while "on duty" since you have been discharged you no longer rate services from JAG
Sorry to have to bear bad news.
Let me know if you have more questions...happy to assist if I can