It... could... be? I'm really horrible identifying photoshop mistakes. But I think that could just be her massive quadricep muscle. You can see how it looks similar on the other leg, but definitely not as pronounced.Is it just me or does here left knee look photoshopped here?
I knew a girl who used to do field hockey in high school and when she flexed her quads looked like that.
Someone her could probably see if it's photoshopped better than I, but dang if it's not, she has muscular legs