The first step is the hardest…Talking & time, followed by more talking & time are the best things to ease her fears. I don’t know why, but we wives fear this means you don’t want us. I imagine it took you some time to accept this facet of your personality, it takes us time also along with feeling reassured that the person we love most still loves us most.
When she’s willing, suggest she joins the SO forum here. It helps us learn what cross dressing is & more importantly what it’s not.
I hope you know that where you are now is not where you will be in the future. Good luck to you both ❤️