Isn't that an attempt to make it safer for cyclist going ahead so that it reduces the risk of motorist turning left across a cycle on nearside of the road?
Down to interpretation. She is clearly gesturing at Celia Ward and continues to do so just as the cyclist comes into shot. This wasn't some young tearaway cycling at break neck speed on the path. Auriol Grey could easily have stepped further to her right but she held her ground and continued...