Looks like a common ghost story, that I first read about in අම්මා's ශ්රී පොත in the year's gone by. I am not a firm believer in ghosts but it might be likely that a spirit connected with a sudden death, may remain for a while. In a night privately arranged bus back from a party in Colombo, a UoP graduate told us about the Uda Peradeniya lady ghost. According to him, first time somebody in a van saw the young figure struggling to come over a ridge on the edge of the road, she was probably alive. But, the rider was so scared that he drove to the nearest settlement and alerted people over there. Alas, when they came back, she had finished grappling with life. Subsequent sightings of the figure, may be connected with an intermittent life. Thanks anyway if your sharing this will shed light on an investigative path.