Let's look at this step by step...
I did ask her specifically what she considers progress for me. She said she doesn’t know.
I think she does know. She wants you to get over it. Wrapping it up in a more polite verbiage doesn't change the fact that what you're looking at is a complaint. Criticism can be constructive, and when it is, it's part of the communication process. But this is open-ended. This says "you need to change".
She says she is willing to answer my questions but it’s clear they frustrate her.
And it's equally clear that she has NOT been willing to answer your questions. Otherwise, you wouldn't have had to go to her AP for information. She allowed that extra dose of humiliation with her continued dishonesty, despite the fact that she's been around here long enough to fully understand the hazards of withholding the truth.
She says she can’t prove what the answers to the questions I think she is lying about and feels like she is fighting a battle she can’t win.
What battle? ...the one where she keeps you in the dark in hopes that you'll just move on and forget about it? At this point, she's supposed to be on YOUR team, not battling you as an adversary to protect her secrets. It doesn't take much in the way of mental acuity to understand that the solution for a poor record of honesty is to BE HONEST, continuously, on every subject, every time. It's consistency which eventually wins new trust. You don't have to be a rocket scientist for that.
All of this is the exact same things she said to me before I contacted AP. So yeah it makes me feel like there are still things she is holding onto.
Of course it makes you think there's more. Because every time you do a little digging... there's more. THAT is what's been consistent since DDay. Not a record of full honesty on her part. So, don't apologize for it. YOU aren't the one who's caused this epic level of distrust.
She doesn’t like the accusations but there is nothing she can do about it but answer honestly.
If only she would. That would be a start. As things stand today, you have no reason to believe her if she tells you the sky is blue. It takes YEARS to recover a modicum of trust when you're dealing with a proven liar... years of consistent truth-telling. Is she even capable of that? It's only been a month since the last data drop.
If it is lies then eventually they will collapse as lies do. If it’s the truth then her story won’t change and maybe I can trust her. I don’t feel it’s pointless to talk about it or ask the way she does somtimes. I feel there is a point and that somthing good can come out of it.
Weirder things have happened. Who knows? Maybe she'll realize one day that lies and manipulation aren't worth the trouble they cause. But recovery isn't just about getting all of the truth. There's so much more that needs to be done. Like this from tl502:
It took over 18 months before My h reached remorse. He put on a good act for most of those 18 months, but he had to realize that our marriage was over and he had to totally change his moral compass and learn boundaries and respect for me as well as for himself. It was long and difficult for us both. We are still fighting the fight 6 1/2 years later.
There needs to be remorse. There needs to be real empathy. You WW is going to have to get deep into her own psyche and root out the flaws in her character. Why does she lie? Why doesn't it faze her do so? Why doesn't she feel guilt when she lies? Why was cheating a choice for her? Why didn't she resolve problems with you or leave honestly? What is it in her character that allows for deceit? Where's her Jiminy Cricket? Does she even have one? Has she learned boundaries? Do you see her working her boundaries in everyday life? Does she respect you? (easier to assess once she's stopped lying to your face). Does she respect other people? Do her stated values align with her actions? Do they align with your own?
The work of a truly remorseful WS is daunting. It's painful. It's humbling. And it's not for everyone. I commend you for wanting to provide the opportunity, but the task is large and the heart of a determined liar is small. Make sure you're keeping those ducks in order. You may end up needing a back-up plan.
Strength and healing to you.