Was her work more important than Newton's, Darwin's, or Watson's? I'm not questioning that she was a great scientist. However, if you are going to remember three, she should not be one of them.
If you had to remember only three you could easily have an argument debating the merits of any three scientists. I wouldn't say her work is more important than those three, but I would say it's on that level. The book "Six Great Scientists" by J.G Crowther seems to think so too. It's quite unfortunate that Wikipedia has very little on her.
Or maybe J.G. Crowther was also fond of diversity.
BTW the most important woman in the history of science was Emmy Noether. Her theorem is central to Classical Mechanics and very important also in Quantum Field Theory.
