From the artist:

“I’ve decided to name her Flidais (pronounce Fli-thash) :3 She lives in an ancient forest far from Ponyville, and helps keep the forest healthy and thriving with life (represented by her cutiemark, which is two oak leaves and an acorn) She is a very peaceful pony, although a bit clumsy.

Flying is not her strong point, so Flidais much prefers to travel by foot.”

I like her a lot actually. She has a unique design, and actual thought was put into her powers and her personality.