I'm going to have to disagree. I think its possible that her cutie mark would be an 사과, 애플 blossom, but it wouldn't make much sense. Her talent is most likely crafting (as shown in The Show Stoppers when she fixed the tree-house) and actually has nothing to do with apples (as far as I can tell). So unless crafting really isn't her talent then I guess the 사과, 애플 blossom would do. However, I think her cutie mark will be something wooden. Maybe a miniature of the tree-house she rebuild.
게시됨 below is a picture comparing how the tree-house looked before 사과, 애플 bloom fixed it.