Join Date: Jul 2009
Location: The great, white expanse of Maine...ugh!
This sounds like either a balance issue or a soreness issue. If she has some pain in her back, or a sore hock, she'll be less likely to canter in one direction. And, as WhiteFoot said, horses have a dominant side and it may well be that she hasn't figured out how to balance on the weaker side. You can fix this through trot work - if there's a lack of balance it'll be evident in trot, too.
And now, the men of the Second Armored Division with their famous close-order swanning about.