In your other post you said that she was very ribby, I'm sure she just wants to eat cuz shes hungry! If you want to work her, maybe take her somewhere there isn't a lot of grass? Mine is a chunky monkey and if I want to work him in grass we fight over who gets control of his head for a few minutes. I always win;D. When she goes to put her head down check her w/the lead. If she doesn't listen get a bit more firm on the tug. Eventually they normally get the idea.