Thank you to all of those people that took the time to respond with kind, thoughtful, intelligent, and compassionate comments.
It appears some replies have imagined elements to my relationship with my daughter and husband that perhaps reflects more on their life experience, than the details in my post. For example, there was no mention of me shouting and screaming, coercion or refusing permission, or there being a lack of trust, in my post.
Suggestions that I am controlling or overbearing are rather unkind and without foundation.
I am thankful that my daughter values my opinion on many issues and we have a great relationship. We trust each other. She simply said on this occasion that she knows we have different views on a nose piercing and thought I would advise against it on medical grounds and convince her of that if she had informed me of her intention.
My upset was as a result of the fact it was done before I knew about it. If she decided that she was going to have it done then I would like to have been sure it was done somewhere reputable and safe. As it happens she did go somewhere safe and she is pleased with the result. She is a very mature woman with a mind of her own and is confident and capable.
My faith in this section of Mumsnet is a little shaken because of some of the more extreme comments. However, as I said before, I am grateful to those that have taken the time to respond with useful and considered replies.