My question involves labor and employment law for the state of: Texas

I will try to be brief but give the facts to provide you with enough detail to make a good judgement. I am 43 and have been a professional business woman for 20 yrs., 15 of those with Fortune 500 companies. I have never been fired before. I was fired from my job last week as Sales Manager at this publically traded company. I was officially in position for only 6 weeks. I was promoted into this job after 3yrs of award winning, exemplary service. The reason for the termination as stated by the President and VP of Sales was for talking with one hourly associate about another hourly's performance (which upon investigation did not occur). The VP of Sales is new to the company. She is an avid drinker/party girl who likes to go out with the hourlys and get drunk. She has been seen in the bar while working. While not a prude, I do not support nor engage in this type behavior. VP knows this. Also, I refused to fire one of my sales people as the VP requested because he was "too old and not what we want" vs performance related issues. I refused. I was directed by the VP never to go to HR for "any reason". The day before being fired, I consulted with HR and the President saw me. Obviously, being fired has been difficult for me. I realize Texas is a right to work state and we can be let go for no reason. The reality is that my boss did not like me and fired me for what I knew regarding her and her "rules of engagement". Any cause for a wrongful termination/defamation suit here?