I can't say anything negative about this singer Dana Winner, she has a very good voice, hits the high notes perfectly and also has quite an expression in her voice. Personally, it doesn't make me shiver like some other singers would, but that remains a personal thing who really touches you and who doesn't.
I just doubt the thesis that the fact she lives in te Netherlands prevented her from getting famous worldwide. Other Dutch people got very famous e.g. in Germany and also worldwide, and nowadays with our media it's less a problem than any time before to overcome geographical "restrictions".
BTW, mentioning Katie Melua... I personally think that her voice is so unique and extremely expressive that she simply had to become famous no matter she is originally from, I think, Georgia. My very personal opinion is that Katie Melua has a more "unique" voice than Dana Winner, who I could mistake for a different singer more easily if she were played on the radio. (Again, just a personal perception).

But we can certainly agree on the fact that some musicians get famous mainly because they are lucky and encounter the ideal conditions while others have more talent and less luck.