I hope you don't mind my attempt. Some of us cannot afford more expensive programs but this was done strictly with clone stamp in Photoshop Elements 8.
I first removed the easiest parts of the line with a smaller brush at 100% copy. I then increase the brush size considerably while lowering the copy to around 25% or so, and then blend over a larger area(where line was).
I then enlarge the photo considerably to work within the hair, choosing a small brush and again around 100% copy(to remove the remaining parts of line). After that, I lower the % and copy from other parts of the hair in filling space and in attempting to make it look natural again. This includes possibly adding length to existing hair in the area, etc. All within the flow of the hair.
More time could have been spent blending it even better but I just wanted to show what you can do. I see there is still a hint of line from her eyebrow running downward a little, but that's easily removed. Parts of the line were actually blended in with the hair where most difficult, btw. Again, a little more time could have made it better still.
Lastly, I did a little sharpening which made the strands stand out even more and thus helping remove/cover any blur area.
Good luck
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