Main thing => Do NOT let her do these things.
If her hip swings out, push it back in .... and then some.
If she breaks into a canter, stop, back, and back some more. And then trot around that end pole 5 or 6 times.
If she throws her head, make her give, give, give her nose .... and then some.
If she doesn't listen to your legs (and zig zags instead of bending/weaving), over exagerrate it and make her listen listen listen and soften up.
But if she does something right, praise! And leave her alone.
And if she does it right on the first run through, don't do the pattern again. However, if she messes up, keep working on components until you end on a good note.
I'm working with Red with a reining trainer right now, and she's really pointed out to me that he's a good horse, but he will try to sneak his way out of work by dropping a shoulder, or sticking his nose to the outside, or losing cadence, etc. But you've just got to keep on him until he "gives in" and does it right. Then leave him be so he still enjoys his job!
∞•*˚ Βгįťţαňγ ˚*•∞
It is not enough to know how to ride; one must know how to fall.