CPS delays, delving into medical records, probably having to do MRI's and CT scans to see whether the driver's brain had any indications of prior seizures, etc, etc.
They can't advertise the fact that she'd had a seizure before the official report came out, because if it did turn out that she'd got evidence of prior seizures they might have been able to prosecute her and putting stuff out to the press could prejudice a fair trial.
Not everything is a conspiracy. Things take time, especially post Covid.
I can understand that the families feel that someone should be responsible, but the poor driver did absolutely nothing wrong. She was driving a legal car, perfectly healthily and something totally unexpected and unpredictable happened. What other conclusion could they have come to? There is no law broken here. No dangerous driving, because she wasn't doing it intentionally. She had a medical episode, that's all.
I see others have said they'd assumed dangerous driving when they saw the news in the first instance. My instant reaction was a medical episode (though I had assumed middle aged man has heart attack type episode, not healthy woman has first epileptic seizure)
Unfortunately I suspect this will end up being dragged through civil courts, so the only people that will win are the solicitors.
For anyone doubting late diagnosed epilepsy, a popular YouTuber has just been diagnosed with it and she shares her story here - - in her case there were some signs over a very long period of time, but nothing that would immediately point to epilepsy until her first seizure.
Despite only having one "proper" seizure, the scans she had showed that she'd got markers in her brain that had confirmed that she'd been having vacant seizures for some time. In this driver's case it's quite possible that the scan showed no evidence of a prior seizure, hence the bringing of no charges.