The advice already given pretty well covers most all the angles. The one thing in common is do what ever you decide to within your own time and comfort limits. It is already a non issue on her finding out and telling someone else, she can do that regardless. The door is open and now it's just how wide? I personaly would make a effort to follow through ASAP befor there could be any bad influences from outside sources, in other words "get it while the gettings good" (acceptance). Besides the fact that everyday you procrastionate is a day lost to enjoying being who ever you want to be and sharing. Time and life are always to short. Don't look back wishing you had, look back remembering the experiance, good or bad it's better than not knowing in most cases.
Fran