It's still new to her. It sounds like she loves you and is afraid for your future. I went through the same with my own mom. I told her at 18, I am 32 now, and she still tells me I could change my mind about all of this. I ask her if she has looked at me lately, but some mamas never give up, lol.
I say that moving out isn't the answer. That is what I did. That is why at 32 years old I am just starting to get everything done. Trust me, life in your twenties will be hard enough just trying to make ends meet with bills. Trying to maintain a vehicle, pay rent, electricity, water, trash, food, etc is going to be hard without a College education. A College education gets harder to achieve once you're on your own and more worried about keeping a roof over your head. Then there's the dead end jobs or the roommates who don't pay their fair share.
What I am telling you all of this for is to think of the bigger picture. I understand you want to transition now and you want full acceptance now, but realize this takes time. Your mom has had barely over a month to digest the fact that she thought she raised a daughter who is really her son. Mama's mind is blown right now, lol. Give her some time and then ease her into it. In the meantime work on your education (if you're not already) because life isn't cheap...and neither is medical transition. Stay at home as long as you can and save money. The more money you can get under your belt to use for medical transition once you are ready to be on your own then the easier all of this will be for you.