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.
[Source: http://pixar.wikia.com/wiki/EVE].
Height is estimation from a fan forum. http://walle-meta.livejournal.com/10488.html