Did you mean something else from flipping?
Your game object's SkeletonComponent or SkeletonAnimation has a Skeleton member named skeleton that has a bool FlipX (and FlipY) you can switch to make the sprite/animation face left or right if that's what you're looking for..
You should check out this diagram too so you can get a slightly better picture of where things are: http://esotericsoftware.com/spine/files ... iagram.png
