It's good that you chose to explore telling her, and unfortunately, the indicators appear negative. But as some one else has said, it's not over yet. People's negative opinions of LGBT people can change as a result of knowing someone close in that condition.
My wife was once a hard liner against my dressing. One reason was I didn't tell her until we had been married for several years. When I did tell her, her feeling was that she would prefer to see me dead than in a dress. And while I definitely felt her negativity, I knew that it was unfair that she demand I quit. In my case, I took it upon myself to move into a spare bedroom. She quickly realized it was better to have me in the same bed and learn to live with the new me.
So don't just assume she will turn sour on you. Complete the discussion and reveal yourself to her. I truly hope it works out well for you. If not, it should be a deal breaker, because you KNOW your CDing won't go away. Good luck. We're all rooting for you.
