So, I told her last night even though I wasn't expecting to. Strange enough she lead the conversation into hormones and therapy sessions. And prior to me coming out she also spoke of pretending to be someone else, and living a happier life. So, I guess that was my sign to tell her, heh.
This was my third time coming out, so I was a lot more relaxed about it, and I kind of already knew what to say. She was a lot more open-minded about it than I had expected, although there were a few things that hinted that she was uneasy (ie "as long as you're not gay or one of those trannies it's okay"). So, there were a few things I had to explain to her. I don't think she's entirely accepting of it yet, but I believe her intention is to be supportive of whatever makes me happiest so long as it doesn't harm others.
"Things went so well for you, so what?" This is what came to mind before I posted this. So, the reason I decided to post how my conversation went is to give advice. I know that coming out to your parents can be very difficult, stressful, and confusing. Believe me, I was dreading telling my Mom for so many reasons. But, it just so happened that things just fell into place for it to happen. I believe that if you're confident, relaxed, and willing to listen to your parents and able to answer any questions things might hopefully go smoothly. My Mom isn't really an open-minded person, and I think that since I hadn't argued with her, and the fact that I was very straight forward with her is what benefitted me.
I hope that others have the same experience.