There are several species of large headed white Brachyscome in the CNM area. Clear photos good enough to remain clear when blown up, of the stem and leaves, and a side on photo of a flower head clear enough to count the green bracts at the base of the flower head can narrow down the ID.
Rob had a look at the species and is pretty sure that it is Rhodanthe anthemoides. He found the same species at Land's End in 2016 and ID'd it at that time.