According to The Chronicle, that is similar to what the initial report said. That Frances suffered injuries when a lawnmower she was moving rolled down an embankment at about 3am.
But (according to the article) investigators are puzzled why Frances would be using a lawnmower at that time, and her family is asking questions.
The police are questioning nearby neighbours, and have requested any possible CCTV.
Upon further investigations, the police deemed the circumstances suspicious. They spent two days gathering evidence.
(paraphrased from
Police declare Upper Lockyer lawnmower rollover death of Frances Crawford as suspicious )
I am wondering if maybe Frances suffered a fatal blow to the head ... from "falling off a tumbling lawnmower".