Broccoli was created by Lady Greensilk, because she got annoyed at the real Pinkie Pie who wanted to be appart of the Vegie Brigade. So Pinkie Pie got cloned, but it failed thus a green pegisus and the personality of Pinkie Pie but a heart for veggies. Later, Broccoli's wings fell off and just became a noral earth pony.
She has none, but has the ability to go fast. In chapter 3, she is shone dashing to Mordecai.