Its just a puppy swim. It will line itself out. I like to throw some longer marks to get them to understand that they wear themselves out swimming that way.
She'll eventually figure it out. They'll swim like this until the newness of being in the water wears off and the intensity to get the dummy increases. They learn to be efficient.
My current GSP would splash so much water he would swim around in circles because he was having trouble finding the dummy. After about three months working in the water, you could practically ski behind him!