Who is Responsible for my Daughter?

I decided some time ago to opt out of the NHS Summary Care Record scheme and a letter from our local Primary Care trust explaining all about the scheme was the trigger for me to do something about it. I rang the telephone number in the letter and requested an opt-out form. Three weeks later I rang again to be told that they would note my request and send a form but was I aware that I could collect a form from my GP? Thus, a week later, I left work early specifically to get to my GPs before they closed at 18.30. On arrival I asked for two forms as, at that time, my fourteen-year old daughter was inclined to opt out as well. They only had one form but suggested that I could download one from the internet but they did not know where on the internet.
Fortunately, a blog that I occasionally read called Big Brother Watch wrote about opting out and provided the very link that I required. I duly printed two copies and set about filling them in. Then I noticed that he form clearly states that it should be completed "by the individual (data subject) making the request." Leaving aside the awful phrase data subject and whether it adds any value to the sentence, I was confused about whether I could fill this in for my daughter. So, I rang the NHS Care Records Service Information Line on 0845 603 8510 and enquired as to how I should proceed. The gentleman on the other end told me that I could complete the form for my daughter but my GP had the right to ignore my request if he or she thought it in the best interests of the child.
So who is responsible for my daughter?