I don't think concluding she is "flaky" is what's happening here.
There have been strict rules against witness coaching in the UK, for good reason, for many years. It's an abuse of process. It makes it hard to distinguish what is genuine testimony first hand from the witness and what has been provided by a third party. If there is witness coaching then the evidence is inadmissible and the trial collapses.
In this case, R v FGD [2026] EWCA Crim 918, the prosecution didn't even attempt to deny that the use of AI amounted to witness coaching / training. The prosecutions defence was that there should be other ways of addressing this prejudice and that the stay needn't be granted.
NB witness coaching is different to witness preparation or familiarisation which is completely legal and designed to give witnesses an idea of what will happen in court and is about the process rather than the testimony.
The use of AI in trials and tribunals has been problematic for a number of years now. "Precedents" have been provided for cases that don't exist; the AI hallucinates them.
As far as I know, this is the first case in which the use of AI technology to has been ruled to be witness coaching.
I suspect it's something we'll see more of to be honest. Technology evolves faster than the law and our courts do, and legislation is always running to keep up.
It's not to do with the accuser as an individual and whether she's flaky or not, it's our courts navigating their way through unchartered waters.