I agree with those that have said that this is a big positive. I see it as part of her wonderful acceptance of your crossdressing. It truly is liberating to be out. I was out to my first wife in my early 20's and she ended up talking to one of her friends and simply needed someone to talk to about it. It quickly ended up with our entire group of friends knowing and it was great being out of the closet that early in my life. I was never upset with her for talking to a friend because I understood why she needed to talk to someone, and I didn't ask her not to tell anyone.
I knew even back then that it's never fair to swear someone to secrecy when coming out to them.
