I noticed that line as well, but figured out what it was pretty quickly. In Helm's edit it isn't removed, it's just hidden in shadow and less...black. Also, in Helms edit, the "line" was given an effect of pressing against her skin, causing an impression. Though I do think Helm's edit the full pixel removed looked kind of odd...
I do think it would look better if it were under that golden buckle thingy of hers, though. I'm wondering what's causing that single sleeve on her jacket (the sleeve she's not wearing.) to just pop out like that while the rest of the sleeve jacket is just limp...?
BTW, I really like that stray curly hair on her head. This piece rocks.