There was actually relatively little publicity about Sarah Everard until several days after she went missing. I don’t think there is anything really strange about the reporting in this case. As you say, many murders of women (and most murders of men) barely make the news.
We have no idea if extreme violence was used. We know the body was dismembered but that may well have been post-mortem or may have been as a result of animals.
Another thing to remember is that sometimes there will be restrictions on reporting because of a child involved. So if the child is likely to be identified if the parent is, the press may not report fully. Or for instance, the Spalding murders where it made little sense that random teens would murder a dinner-lady and her daughter but made a lot more sense when the killers were revealed to be the woman’s other daughter and her boyfriend.
Here, the press did report. They named the woman and showed photos of her. I don’t know what else people expect really.