Re: coaching Halep from behind the keyboard
To be the first to answer the question, I'll say she needs to move forwards more. It pains me to see her hit great balls deep in the corner, and still wait behind the baseline, instead of stepping inside the court to keep the pressure on and take the balls early.
I think if she can do that, she'll quickly add another dimension to her game. She'll keep the rallies shorter and will win most of those points.