You need to nicely and kindly educate her. Your a girl now and not a guy. Yes, your body needs to changes to outwardly show it, but your a girl now. She will start to get the message as you go through things like hormones, surgery (if you want any), clothing, makeup, and I could go on but you get the idea. Just educate her about the difference and share with her how you feel about how she is handling your name right now. It's important to be open with are partners. Hugs
Mariah