Is she a person that you are married to/dating or is she a co-worker? When do you bump into her during the week? I wouldn't worry about it that much, because it is none of her business to know exactly when you are/want to transition until you are fully comfortable telling people about what you are doing. And if you already tell some people about what you are doing, it still not their business to know if you are transitioning. Because even if you do want to transition, it won't effect that person's life in any way, shape or form, it's your life that you are living not their live.
I wouldn't let that person effect my decision of what you are going to do. And even if she won't respond to you, it's her problem, not accepting the person who you actually are.
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