Pupil size is different in everyone. Commonly, they can be large in young people, and tend to get smaller as people get older. The important things are that they work normally, meaning react to light), are roughly equal, and round. The adjusting of the pupil you mention is called "hippus", commonly observed in young people.
If she is abnormally light sensitive, I would recommend sun shades when she goes out. There are special opaque contact lenses with a small central opening to limit the light coming in, but this would only be consider if she was very light sensitive.
It sounds like the previous exams have been normal, and from what you have told me, it does not seem out of the ordinary. I would not worry about sun damage because of the large pupils. The natural lens
has is able to block some UV rays fromt the sun. She should wear sun shades when in the bright sun, but not doing so won't cause extra damage.
Remember to press the green accept button. It was a pleasure helping you with your question. Best wishes to you and your daughter.
Disclaimer: Information provided is for educational purposes only and does not establish a patient-physician relationship nor substitute for a personal consultation with a physician.