Thinking the same, that she did not proceed further along Poynders than that Clarence junction.
There is a video off the TFL camera on Poynders/Kings at 9.30 - not sure how to embed video here? - that shows a man and a dog. Now, this is obviously a local and whether or not he has come forward, we don't know, but he would have been more likely to notice her if she was still on that road than any other pedestrian perhaps who was hurrying to get somewhere. Walking a dog means frequent stop/starts while dog sniffs and





a leg, and human will glance around.
That brings us back to her either turning off onto Clarence, or something occurring just as phone call ended and just before or at point she reached. So there we have the AR Gardens, the estate, the deep road excavation works as mentioned by earlier poster.