Muffin:
First off, thank you! Truly, spousal approval is so very important. Actually, nine out of ten marriages fail because one of the spouses transition. It is truly refreshing to see you not only accepting, but enthusiastic!
Now the difficult part,the rest of the world.
You can choose to tell whoever you wish, whenever you wish. Or not at all, if you choose, it really is up to you. However, sooner or later her transition will become public knowledge. She will not be able, or want to, hide her changing body and she will have to learn how to carry herself as a woman in society. You can either be ahead of the inevitable confrontation with your bigoted co-workers by telling them, or get blind-sided someday when they confront you. If you do it, you have the advantage of setting the time and situation where you do it. Also their bigoted talk may break down when they are shown a happy and well adjusted couple.
Also, depending on where you work, you may also have to use the stick of harassment on them and complain to management. Be sure to make management aware of the situation before you open up to your co-workers.
Her father is another matter. When we transition, we have to make the decision that we are going to live our lives our way, for us. Not for someone else. And everyone can come with or be left behind. If your boo starts to get depressed because of her fathers' demeaning manner, she may just have to walk away. Occasionally though, even the most die-hard naysayers come around, given time, and seeing that the person who transitions is happier than they've ever been and it becomes clear that no amount of dissing will cause them to go back.
It sounds like both you and her are in the early stages of transition. I hope her therapist has given her the information she will need so that she can prepare herself for her journey. So many things to take care of! If not, there is always plenty of advice from your friends here.
There will be disappointments in this journey, you will not be able to avoid that. But by not dwelling on the negatives, you will find that the potholes are few and the adventure is great!
Buckle up! It's going to be quite a ride!
-Sandy