That's quite poor of them, the regulations are tight for software like that, but in her case, it looks as if she'd be accepted. Though it is very hard to get such editing features for GCSE I know, despite evidence, they want to keep the numbers as small as possible because they say that then it's not a true reflection and it blurries fair SPaG marks compared to others but obviously in her case examiners will likely just not bother to properly read it slowly as it will take time and as they have no information on the candidates they won't know that it's due to dyslexia. Whereas in universities, they often have schemes for that, considerate marking etc, where they inform examiners about x issues and so students with dyslexia for example won't be penalised for bad spelling for example. It works quite well but obviously a harder role out nationally for something like GCSEs. That's why I asked about a scribe, as that could have off set some of those potential problems, but again difficult requirements.
Are you in Essex county Council? Just as they have stopped funding or accepting any diagnosis for dyslexia, they've essentially said they don't believe in it, so now where kids would be having an Ed Psych assessment for it, they no longer can in Essex. It's causing major issues especially when kids with later diagnoses are trying to apply for things like DSA etc and lack speicifc pieces of evidence.
I understand the examiners POV, but the impact it has on students grades is to big for that excuse to be acceptable, though it often happens. In fact as someone whose talked to many examiners, many did remark if (even though they remained fair), they were more harsh unconsciously with those essays they marked late at night, when tired or close to the deadline. Were they unknowingly more harsh with them, or if they had poor handwriting less willing/patient to try and understand it.
What ones have you put up for review? It may still be a luck of the draw, on getting someone willing to actually spend the time, whereas her teacher would have been, the examiners may not have. I'm very sorry for her, as it's not a level playing field for someone like her if you block her from the software and other adjustments to make it one.