Good point about the infrastructure. I haven’t followed the case closely, but, I do recall that neither local authority or police were able to confirm or deny if the path in question was designated as a shared path.
I am sure we all know cycle paths that are like this
Many round here start up as a wide pavement and then at some point it is narrower - with no signs of any termination of it's category as a shared path
So the cyclist could well be cycling along a clearly marked cycle path and then arrive at a point where a walker coming the other way has seen no sign if it being a cycle path
On this point - as a retired teacher I have attended a lot of "training" sessions about all sorted of Special Needs - including ASD (autism)
and I have taught pupils who have a diagnosis of this
One of the things we were told is a common characteristic of ASD is a sense of what is right and wrong that is quite judgemental and absolute
Hence someone who thinks that the rules say this - can become very annoyed (or worse) if they see someone not following these rules
an example given was an empty supermarket car park
a normal person would happily drive diagonally across all the marking because there are no other cars there
some people with ASD would regard this as totally unacceptable
In school we were told to be careful and make sure they were aware of the rules and be aware that they might have problems if other pupils didn;t follow them
The same could apply here
She saw someone who was cycling on a pavement which is prohibited by the Highway Code - AKA The Rules
This could be a serious trigger for some ASD people
whether or not this is the case only people who know her - especially medical people - would know
but she might be one of the victims here - although I will save my sympathy for the family of the cyclist and the car driver and her family