The Boxall Profile is a checklist that teachers use, consisting of something like 34 statements and they rate the child on how well or not they fit each statement, it just helps them get a better understanding of the child and prvide for them better.
It was developed to help nurture children in school, and to support their emotional needs.
If you object to them doing the boxall profile with her, then you are beign very PFBish and very unreasonable too.
I'd suggest you make an appointment to speak to the SENCO, she will probably reassure you more than the head did and can talk you through the profile etc.