If you have a riding crop, use it. Pull her nose into a tight circle, and grab the left rein with your right hand. Use the crop and give her a whack on the hip to make her move her hindquarters over. When she's done a circle, allow her to straighten out and see if she'll walk forward. Since she's now felt the crop, often times just threatening to use it is enough. If not, do another tight circle. The first time may not give you the results you want but usually the second or third time will. You are teaching her that she doesn't make the decision to go home.