Ok so here is the update from today.
Her owner called the vet and told her that she thinks it to be a windpuff. The vet said to treat it as if it is one for ONE WEEK and then call her back with the results. The treatment plan is to give her complete rest for one week and to cold hose it twice a day.
I guess we will see. The vet says if it is, infact, a fused fetlock, theres not much they can do for her anyways. She agrees that an x ray at this time just isn't possible. If it stays the same, we will start working with rosie to get her better about being vetted.