I feels for you, I'm sorry that this has happened to you, but I certainly value your courage to keep moving forward. If she can't accept her own daughter, then that's her problem, as long as you are happy.
And I can relate to a certain part. I am a FtM, and when I came out to my mom, she constantly bothered me about 'You never showed signs' or 'How can we cure this?' I kept insisting that the only cure in my case was transitioning, however, she had other plans, saying that had I been any younger at time, she would've put me on E to make me 'feel more female'.... I told her that it wouldn't work, and I would kill myself if she came at me with any of her BS 'cures' (Even though I would never acually try) A few talks, fights, and suicide threats later and after two to three months she has accepted me fully.
I really hope your mom will come around and try to understand better, but until then, keep moving forward I guess... (: