Nikki, u haven't mentioned WHY u want/need to tell her? Do u wish to dress in front of her? Maybe go out with her dressed? R u feeling guilty? R u planning to "come out" to everyone?

If you're a closet dresser, don't plan to go out dressed, don't plan on coming out, why do u need to tell her NOW? This is actually may be important info if u want really helpful advice!

Unless there's some over riding reason for u to tell her now, my advice is, "NOT YET"!