She could potentially be a Ponyville (first image shows one of many poses) pony or a figure from the My Busy Books Welcome to Ponyville book (second image).
Sorry but you are not allowed to view spoiler contents.
If she's G3.5, there are a few more possibilities. Once again, she could be from the Ponyville line (first, her head always faces the side w/ her cutie mark), or from some European exclusive blind bags (second, she came standing or rearing).
Sorry but you are not allowed to view spoiler contents.