Should I(REALTOR) sue my Ex-Broker? Is this Defamation of Character??? Help!?

My question involves defamation in the state of:
After I left my previous Broker she filed 2 Ethics complaints against me dealing with a MLS violation with both Texas Asscosiation of Realtors and Texas Real Estate Commission. In this complaint packet, she included very malacios charecter attacks claiming that I was an extorsionist trying to get more commission from her, that I was a flippiant, a lier, that a did "flagrant abuse" as my position of MLS presidant (which I even stepped down to apease her after I found she turned in a complaint), saying that I incited sellers to terminate, and she even shared the complaint packet with almost every member of the board in my county because she was trying to get them to persue me as well. Needless to say, after 6 months of Texas Real Estate Commission investgation, they dismissied her complaint...HOWEVER, they said that this would stay in my file. The board even said that "the private matters of charecter and possible rude behavior" is private matters and outside of the agencys jurisdiction.
What gets me is that now I have my final hearing coming up in a few weeks with the other board to go through all this once again. Hopefully they will do the same with this matter as the higher Real Estate board did.
Now, my concern is the damage that she has caused me and that all this non-sense of a discruntled Broker is going to stay in my file now forever. Do you think I have a case to sue her for all this drama, humilaation I have had to deal with for well over 6 months?
These people in these boards hold my career in their hands and my liscense and she has told them all this malacios lies and charecter debate blows. Everyone in my county that is a Realtor even knows what has gone on. What should I do????

I'd let it go. Impossible to win