As shown above, Daisy doesn't seem to fit into Disney's "Fab Five", but Pluto does. Why does Daisy get short shrift? Well, if one looks at the original Disney cartoons, he or she would notice that Donald Duck appeared in over 150 of them. How many was Daisy in? Just 11.
While it seems that she must have had more appearances than that, in reality 11 is all she appeared in. While she has since had more appearances on television shows, her classic appearances were quite limited. It's a testament to her character that she made such a huge impression in so few appearances.