My thinking was, given the difficulty in proving epilepsy that pp have shared, coming up with a a post-accident diagnosis would serve to strengthen her argument that she did have a seizure at the wheel. And then assuming there’s no evidence of prior knowledge, it’s credible she unfortunately did have her first seizure at the wheel.
Bearing in mind a court would need guilt proven beyond reasonable doubt, I expect this would raise sufficient reasonable doubt hence the CPS decision not to proceed?
It also opens up a line of enquiry as to why she would need to go to a Dubai doctor though and perhaps that wasn’t followed up on 🤨. (Big caveat, I know I am now going to far with the ideas). But anyway, just guessing what purpose a Dubai diagnosed post diagnosis would give.