send it to me my email address and then we can chat about it. If she writes a bad one then first of all you know she will not be a good reference and second you can remind her that legally negative references is really a personal interpretation and can open the company up to large law suits. This way she will know to say we only give dates of employement. You can use past employers or supervisors as your references at that point and tell the future emp. that they will only give dates. Also you can go directly to the HR dept. for your reference. I guarantee you they will only give dates of employment.
Be sure to let everyone know that you put them down as a reference so that they can expect a phone call (also they will be on the look out for it). Plus lots of times in interviews they will ask you..."what will this person say about you"....then you will have a good idea!!