Jocasta Nu survives that bit with the murder (somehow) and winds up with Rebel Intelligence (where else). Post ANH she ends up teaching Luke and possibly also Leia. Certain truths may get told a sight earlier (cough*Vader*cough). On a completely unrelated note it's not exactly easy for sundry rebels to take Vader seriously anymore due to someone spreading Temple gossip courtesy of the de facto Jedi Grandmother.
Okay but why not go full AU here and drop Jocasta into the Double Agent Vader storyline.
She’s an intelligence agent, of course, and by the time we reach the OT period she’s probably working closely with Mon Mothma herself. And if we assume that Anakin shared a bit of Tatooine culture with her (though far from everything), then she might very well recognize the name Ekkreth. Especially since she already knows that Anakin is Vader.
If Jocasta survived, I think it would be because Anakin failed to kill her in the Temple. Which, realistically, would probably mean he knowingly let her escape. So she knows better than anyone, even Obi-Wan or Yoda, exactly what he did. She was there.
So it’s going to be difficult for her, to say the least. She cared a lot about this kid, and she did what she could to help him without fully understanding the situation and without having regular access to him, and obviously something went horribly wrong. She was there in the Temple. She knows what happened. She knows what he did. It’s not something she can ever forget. Sometimes the thought of it makes her physically ill.
But she also sees what he’s doing now, and she’s perhaps better equipped to work with him than most other members of Alliance Intelligence. When the Inquisitors’ lists of Force sensitive children start coming in, she knows what that means. And when his coded phrases reference Tatooine stories, sometimes she knows what that means, too.
Eventually she sends him a coded message directly. That wouldn’t be completely out of the ordinary - Anakin’s primary Rebel contact is Leia, but sometimes he communicates with Mon Mothma as well. But when he gets this message, he knows it’s not from Mon Mothma. She doesn’t usually send physical deliveries, and she certainly wouldn’t send something like this: a carefully wrapped package of biscuits, with a note included that says “Don’t forget again.” It’s signed “Grandma.”
It’s a pretty big risk, even if there is no directly incriminating information. But Jocasta’s felt alone for a long time now. She has a place in the Rebellion, but most of her life was spent surrounded by other Jedi, and now it’s just her. Just her, and on the rare occasions when they’re stationed on the same base there’s Ahsoka Tano, grown now and insisting she’s not a Jedi. And now Ekkreth, someone she once knew as a boy called Anakin. He’s grown now, too, and it’s no less strange than Ahsoka. She’s used to thinking of both of them as children.
And yes, there’s quite a large part of Jocasta that blames Anakin for the loss of the Order and the Republic. But he’s also the only one left, and sometimes she isn’t sure if she blames him or if she blames the Jedi or even herself. It would be easiest, and maybe best, to simply blame Palpatine, but Jocasta’s learned that logic alone can only get you so far. Her emotions are harder to tame. It’s funny, she thinks bleakly sometimes, that it took the loss of everything she’d ever known and believed for her to start questioning those beliefs.
So she doesn’t know how she feels, really. But a few weeks later, when a delivery arrives for her on the Rebel base on Settra, she lets herself smile about it. There’s a seemingly untouched package of biscuits inside. Beneath every biscuit there’s a datastick. She runs each of them through the decryptions. They’re copies - abbreviated, limited, but there - of the Jedi Archives.
Eventually, she hopes, they’ll meet again in person. She still doesn’t know what she’ll do. But this is something. It’s a beginning.