Been on the other side (spouse is ftm). As someone in a similar position who was not really interested in men (but now very much so to my husband), keep in mind that she does not need to be attracted to all women, just you.
My recommendation for an easy place to start, for both of you, is for you to dress up around her. Put on a dress and makeup, or some other feminine outfit (however it is you want to dress, whatever makes you feel pretty). Try to look how you want to. See if she's still attracted to you. When you're both comfortable, take it to the bedroom, and give it a shot. If she's still enjoying it, then that's what's important!
Physical transitions don't happen overnight, and I was able to get used to the changes as they happened. I still see the same person I saw when we first got together, and even though there are some physical differences, he's the same person he's always been.
The hardest part for me was the social aspect, not the attraction. While I could try to give suggestions here, if this is a struggle for you or her, seriously seek a therapist. This isn't something that's easy to overcome, and it will take time.
Good luck!
Only really him, though I don't categorize myself as anything (bi, pan, straight, whatever). My only real concern is whether I find who I'm with to be attractive, and the answer to that is yes. I guess that'd make me pan?
As far as I'm aware, not really, but I'd have to ask. He does find my attraction to him to be important, but hasn't mentioned anything beyond that to me (maybe to his therapist but I don't want to ask him too much about that).