In her debut episode, she wanted more things after seeing all the nice stuff all her friends got, and sobbed about it. Later, some salesmen showed up and told her about the new store called Stuff-Mart that has everything she wants.
Despite being a blueberry, she is around the same size as Bob. In reality, blueberries are as small as peas. The size was changed possibly because she would look very tiny in the animation and be too hard to animate.