It is tragic that this cyclist has died. I am so sorry for her and her family.
However, I don't think the pedestrian should have been convicted of manslaughter.
She was on a pavement, where it wasn't reasonably foreseeable that she would encounter a cyclist.
The cyclist should not have been on the pavement. This could possibly be considered as contributory negligence.
To say that the pedestrian was territorial about the pavement was inappropriate, as it is supported by law that cyclists shouldn't ride on pavements.
The pedestrian was partially sighted, which meant she couldn't see the cyclist as well or as early as other sighted people might. Therefore her reaction was more shocked, as she had less time to prepare her response.
She also has cerebral palsy, so it is possible that her gesture was less controlled and she couldn't reasonably foresee that it would lead to the cyclist going into the traffic.
Swearing at the cyclist is immaterial and should not be taken into account for conviction. I hope she appeals the conviction.
All in all, very sad.