It's not that uncommon for this to happen. It happened with Carrie Fisher and Tom Petty, both of whom had one source or another announce their deaths before it was confirmed, or before they actually passed. It Petty's case, it was the LA PD that made the mistaken call. In both of those cases, and I suspect with Roberts, they appeared to be near death, or the doctors expected it, and the announcement was made prematurely, which is terrible, and deeply upsetting to the families.
Not only did THAT '70s SHOW earn Tanya some overdue respect, but her much-maligned performance as SHEENA has gained stature over the years, especially among environmentalists and animal rights activists who don't give a damn about movie critic opinions. Even detractors admit that her earnest commitment to the strenuous part was impressive, and I've always maintained that a person raised in semi-isolation who is told she's a goddess in human form would indeed speak in over-emphatic, forced declarative statements when she finally encounters strangers in her midst. In some ways, Tanya was more honestly Sheena than a better actress with more seasoned finesse might have been.