From the "been there, done that" department...
After two years of marriage, knowing that I was feminine when we married, knowing I wanted to crossdress (still hadn't admitted being transgender to myself, but amassing information and persuading myself that I didn't need/want to transition) my (now-ex) wife "let" me dress in drag. I had bought a wig, breast forms, an outfit, even shoes previously with her blessing... one weekend with the kids out of the house I tried it out. She was horrified. She claimed that it was such a shock, seeing another woman in the house, that she couldn't stand it after all.
I believed I had to bury that in myself in order to stay with her. Twelve years later I was still burying bits of myself, my bisexuality (which she had been "fine" with before, even supportive, but which disgusted her later), my hopes, my dreams, my joy... everything. Things turned very emotionally abusive after that two year mark, too, and I thought I had to change myself to stay in the relationship, because I had vowed to be with her for a lifetime.
It took getting out of that marriage to begin to believe I had any self worth. Lots of therapy, too. Then I got a girlfriend, who was very gender-queer herself, who was masculine to my feminine, who would protect me and hold me, and I thought, OK, I can do this... I can be a "man" to the world if I can have this. This, too, soured; she began to resent my feminine side, said that it forced her to be masculine all the time, etc. She tried to take away my clothes, to make a "man" out of me. She had all kinds of theories about why I was the way I was and was certain she could "fix" me.
I broke up with her soon after, and it wasn't pretty.
I guess what I'm trying to say is that you must be honest with yourself and true to who you are; if you compromise on that, your relationship will be at best an armed truce. If she truly loves you, if she can accept all of you, things will work out. But, in my opinion, you have to be willing to let her go in order to be true to yourself. You also should be willing to work with her if she does try; perhaps your gender therapist can work with her as well, or refer you to someone who can work with you as a couple.
It took me nearly forty years to stand, truly, on my own feet and be true to myself. The difference is quite amazing. Good luck on your journey, sister.

*edit: PS- I now am in a wonderful relationship with a lovely woman who truly wants what is best for me. Even her children have accepted and welcomed my transition.