Here's the dilemma. Basically I was fired from the person at head office. I met her once. .
In that case she was probably making a business decision or she was responding to complaints from other employees, so she has less reason to feel personally awkward about being honest with you. The only reason she would have for not being frank would be fear of disgruntling you enough to come back with a lawyer. If you can communicate to her that you only want to use the information to improve yourself she shouldn't mind telling you what the deal was.
Give her a call and ask for an appointment. The worst that will happen is that she will say no or blow you off. Cost to you: zero