Sorry to hear that from your friend, but good to hear it may be 80% contained.
She said the fire department did not have any clue as to what started the fire. It’s not a place that has a lot of traffic, and there are several feet between the road and sidewalk, so it is doubtful it was a cigarette butt tossed out the window.
The news at the bottom of the hour just reported two more wildfires in the north Austin area. Both are in greenbelts - which are nothing but fry hay now. That seems strange, since those areas have little foot traffic.
fry hay = DRY hay