Broken or sprain?

Hello All. Yesterday my buff duck hurt herself. Not sure how but she had a pretty bad limp. Now she doesn't want to put any pressure on it at all. She has been in a cage during the day and in the coop at night. She doesnt move in the coop so feel comfortable with this. I dont feel a break but not totally sure. She is enjoying a warm bath now but isnt really using the injured leg to move around. Not the best picture of the leg. Any advice on how to know if it is a break?