No, sadly, it might not ever stop.
My xWW has been and is doing precisely the same.
We had trial in September 2020, 2 years after her decision to file for a divorce. She had already been dating her new guy for 1.5 years at this point (and cheating on him, repeatedly). She lied lied and lied some more to convince our custody evaluator to award her 70% custody of our kids (and the associated child support payment). Furthermore, she had gotten a temporary ruling that was so unfair in her favor that she had saved almost $15,000 over the previous 12 months, whereas I had to take a second job and I was still unable to pay all of my bills (and mind you, I make double her income, prior to support payments).
While at trial, I had an expert witness who showed up a little early and he got to watch about 20 minutes of her testimony. After trial, this expert witness called my attorney afterwards to inquire if I had cheated on her because she was SO ANGRY. ... basically, he had worked with me directly for maybe an hour and he assumed that I wasn't the type to cheat on my wife.
Simply put, narcissists often have a need to make themselves out to be the victim. That is the case with my xWW and I am guessing the same is true of yours.
The solution? Don't get involved to the best of your ability -- the grey rock approach. Do not respond to her emotional accusations with anything that is opinion. Just that facts, ma'am.
She's not your monkey and she's not your circus. She will likely disparage you to your kids, repeatedly -- narcissists are well-known to practice parental alienation.
This disparagement is specifically forbidden by my parenting agreement. Whenever I find out something specific, I send her a bland message that reports my evidence and a statement that she's violating the parenting agreement (I usually quote the parenting agreement). She always responds with vitriol, but I don't respond to that.
I don't ever bring up her lying, cheating, or other BS. I don't discuss anything personal or anything that could be characterized as an opinion.
The beauty of the grey rock approach is that it is the MOST OFFENSIVE THING THAT YOU COULD EVER DO TO HER. She doesn't care whether or not you love her or hate her as long as you fill her need for attention. Grey rocking it starves her attention appetite. It's painful beyond belief.
And here is the best part... eventually, you stop pretending to be a grey rock and you actually stop caring about anything that she says or does. It's like the weather... it can be rain, sun, hurricane or blizzard... it's out of your control. You deal with it, but it really doesn't affect your day to day life.
(to be honest, my xWW could drop dead and it wouldn't affect me emotionally -- I never knew the real xWW anyway).