She doesn't mean that you don't have a good relationship w/her at all! I have a wonderful relationship w/Jackson, but he is pretty disrespectful. He follows me around also, but there are times that if he could talk he would be saying "forget you, I do what I want!".
Try getting her in a small area. Carry a whip/crop(Not to hit with!) Walk around, and everytime she comes close, chase her away. In the herd, a dominant mare would do this to assert dominance, not letting her return to the herd until she shows proper respect by putting her head down, licking and chewing, etc... I don't mean to sound condescending, I just don't know what your entire back ground is. Horses don't go by people logic, we have to learn what they understand and respect and use that.