
This is called crabbing and is very common especially with ring wise dogs who like you say are anticipating that they will be turning left all the time in the movement patterns be it turns, triangle or round the ring.
One way is to go the wrong way around with her on the other side of you, but it will work with her on the left also in practice, also turn to the right on your up and downs, and also try moving ahead of her.
This is assuming ther is no physical reason for her doing it as has been addressed by the other post :D.
Also at six months her front and rear may also be out of balnce and she may be doing it to avoid the hind feet hitting into the front ones, as often at this age they are bum high in many breeds.