I have to disagree with this conclusion. I'm not against killing someone (in a story, not for real! come on!) but the poster's stated reason for her existence is taken away by her being killed with no one currently left to fill that role. It also does not force enormous character development. It is a possible path to furthering character development, but a lifetime of watching movies tells me that nothing can force any kind of character development, whether it should or not. The purpose her death serves is already served by Uncle Ben's death. Her death would serve to advance that purpose where he hasn't had much loss or a recent reminder of his original lesson, allowing him to begin finding contentment and to think that the original lesson maybe isn't his driving force anymore only to be harshly reminded. It could also serve a purpose in giving him a new lesson. In this second movie, he is still somewhat freshly dealing with the lessons taught by the first. In a series of two movies it may be unnecessary to have two deaths that serve a similar purpose for the character. It simply may be "too soon." Further, as is pointed out in the article, in this instance the death is seemingly used to show that his purpose is to live and fight alone and that a confident and smart woman needs to listen to her love interest, suppress her own call to action and heroic urges or face death.
I'm not arguing for or against the death itself. I'm arguing that the motivation for including the death the way it was and the overall themes and messages of the story may not be entirely compatible in this instance.