I have been practicing some different exercises the past few months, and they definitely help. She's gotten great at serpentines. The past two rides I've thrown in some circles into the serpentines (so I guess they aren't serpentines anymore), and it help tremendously.

I do need to work on her haunches in. She's not very good at it, but I do think it's partially my fault, since I don't practice enough. If I can get her to do it properly, it works just as well as leg yielding off a circle.

Something I forgot to mention in my first post is that she has a long body. She will just go a long with her butt to the rail, rather crookedly, if you don't pay attention.