Pink Water Lily (Nymphaea sp.)

Australian water lilies include at least 9 species, all of which are much more cold-sensitive than the exotic tropical hybrids. Exact ID of this spotting yet to be determined. Perhaps this is a hybrid species, and it may not be a native either. Anyone? My initial investigations are leaning towards Nymphaea pubescens, a species found in northeastern Australia, although image searches show this species to have reasonably thin and pointed petals, whereas my spotting is quite rounded. Another possibility is Nymphaea masaniello, also an Australian native or so I'm led to believe. Then there are countless cultivars which just confuse everything :-/