I agree with Wallaby, that sounds very counterproductive to me. Of course, I'll use different cues depending on what kind of turn I need, but I would think that the trainer would work with you on refining the cues that Saro already knows instead of trying to undo the ones she's got and add a whole new set.
Just as a "for example" on 3 different kinds of left turn.
1: For a rollback type turn where their hind end stays completely stationary and their front end sort of "sweeps" around; I sit deep as if asking for a stop, I apply right leg and right neck rein. I keep my left leg completely off of them in this situation
2: For a turn around an object like a barrel or a tree or a gully to keep from banging my knee; I use outside leg a little farther back toward their flank, inside leg up by the girth to support the middle of their barrel and create some "bend" in their body, and outside rein to point their nose around what they are turning around.
3: A forehand turn, but the only time I purposefully use this turn is when I'm roping and need to turn to face the other way without putting any slack in the rope; this is the one and only time I'll use right neck rein and left leg. I use the rein on the right side of their neck to keep them from moving their shoulders (and to keep them pointing their head in the way I want it), and I use my left leg to move their hindquarters around. In this instance I leave my right leg completely off of them.
Oh, and I don't ever kick a horse unless I've had to work my way up to it because they ignored a squeeze and a bump with my leg. To immediately start off at a kick will deaden a horse's sides.
I don't know, I think I'd be looking around at other trainers. The way it sounds to me, Saro isn't being resistant, she's just confused because the cues that she's known for the last 5 years suddenly mean something totally different. That the trainer is ordering you to really get after her because she's hesitant and confused and frustrated bothers me.