My very personal opinion… You are still in time to do what you may already know is the right thing for you.
People really doesn’t change. Her lack of acceptance now is unlikely to become into enthusiasm after a while. And your desire to crossdress is not likely going to go away.
You already showed her your cards, and know what to expect. Time to let her know that much as you care for her, you need to know if she is willing to accept all of you. Before you two invest much more into this relationship. It is part of your baggage, as I’m sure she has some of her own.
A sad breakup today may be much less painful than years and years of regret.