EVE has all necessary parts of a probe droid. She has an ergonomically suitable shape, scanner, flight at high speeds to cross ground quickly and morphable fingers for different purposes. EVE is also armed with a plasma cannon in her right arm. However, it is odd that a simple probe would have a plasma gun. The gun might have been installed to remove obstacles and attack enemies. An example of this is when she blasts away an electromagnet she is trapped by.
Height is estimation from a fan forum. http://walle-meta.livejournal.com/10488.html