Well, I didn't think my tentative proposal that Vivian had been "fast-tracked to the pantheon of great photographers because of her romantic back-story" would be so comprehensively shot down by almost all my readers (thanks Antonio!) who left comments. That's the last time I take you lot on! Seriously, though, I'm a life-long contrarian used to holding minority views so I can live with the opprobrium. Stick your head above the parapet, etc.
I loved the passion and enthusiasm for Vivian that shone through in many of the comments. I'm sure she'd be overwhelmed to know the high regard in which many - myself included - hold her. What a damned shame that she couldn't have lived to see how big a photographic celebrity she's become but it's not the first time that's happened to an artist and it won't be the last.
Having said that, it's entirely possible, being such a shy, introverted and attention-avoiding person, that she would have struggled to handle fame. Her personality no doubt played a major part in the way she approached photography and the success she enjoyed in her image-making. A more gregarious person might have found other interests aside from photography or been side-tracked (in the best possible way) by a family.
So thanks to everyone who took the time to add a comment to my post. I read every one, thought about them and appreciated many of the points you made. I still stick to my same opinion of Vivian's photography - that it's excellent but not quite up there with the best - but now I know that it's a view that largely seems to be my own. A contrarian to the last...