My oldest was not able to get the whooping cough vaccine, she had a serious reaction to the first shot at 2 months. It was scary. We lived in Boulder and homeschooled until she was 7, and due to the large number of unvaccinated children (1997) we had an outbreak of it. Now she is an adult and if she was in a college dorm and people chose to not vaccinate she would be at risk again. So I have a personal interest, and I also researched vaccines and didn't just do them without thought.
And I know it is hard, but I recall the feeling when I was a new mom and everyone wanted to make decisions for my children. I know it is not unique but it was painful. Just a few years ago my mom stopped bringing ham to my house and saying that she had to so my kids weren't deprived, sigh. When she or other people respected my judgement it meant a lot. So (I haven't kept up on the whole thread) I wonder if you can think about it as a way to support and respect your daughter. We all appear or try to appear confident, however parenting is really a nerve wracking process.