Hi, Mike,
Having our kids diagnosed it what leads a lot of us to finally understand what's been going on our whole lives. I would not consider myself AS (though I am probably a shadow), and I definitely have ADD. I would have never known that my problem was ADD until my son was diagnosed and I was trying to learn to help him.
I understand your feelings about how people might react if you said something, but honestly, I think it made my mother feel relieved to know I have ADD. She said it made a lot of things about my childhood make a lot more sense. Like why punishing me when I failed to initiate or follow through on things didn't work. Or why I would spend hours doing my homework, but not turn it in. Or how when I told her I didn't know how to clean up my room, I really meant it, I was not just trying to get out of cleaning my room.
If you just hang back and spend time educating your family and friends about your daughter, there might just come a time when you won't have to share your suspicions with them. They might see it for themselves.