As a parent you are entitled to see any data they are holding on your child at a state maintained school. The situation is slightly different for independent schools.
Information here: ico.org.uk/for_the_public/topic_specific_guides/schools/pupils_info
My advice would be to e-mail the HT and reiterate what you understand her position is in relation to your requesting this information.
Copy that e-mail to the Head of Governors, with a complaint stating that neither the teacher nor the HT are willing to allow a parent to understand how their child is doing since the start of the school year. Most governors will now allow individual complaints - so it is important that you are complaining on behalf of all parents right to access this information the school holds should they wish to - so basically asking for a better system of communication of pupils' progress with parents.
It is important not to insist that progress data is recorded in any particular system (NC LEVELS/ APP SCORES/ ETC...)- that is their choice - but that whatever system they are using that data on your child is subject to the Freedom of Information Act and you do have a legal right to access it.
You do have to give the HT and the Governors adequate time to deal with the complaint (your school should have a complaints procedure system which will explain the time frames in such instances).
You must allow the HT/ Governors the adequate time to respond but in the meantime find out who to contact in the LEA regarding a school denying you access to your child's progress records.
It is never pleasant getting into this situation with the school but my advice is
- you are correct to feel you have to right to see this data
- remain calm at all times (no matter how difficult that might be)
- from this point do not attend meetings on your own and my advice is that you record them.
- with any conversations on this - prepare a summary and e-mail it to the school requesting them to alter your minutes if they have any objections to specific points.
- make it clear that any legal expenses you incur in fighting for this would be reclaimed from the school should you win
- make it clear that taking this to court, which you are entirely prepared to do, would result in very negative publicity for the school and the HT.
I find this attitude schools have in relation to informing parents of slow/ good/ speedy progress of their children incredibly unhelpful - in the worst cases, as in the case of my DD1, you find out so late in the day your child is seriously struggling that as a parent you're left with a huge uphill battle to turn things around. Tracking pupil progress should be central to what schools do, should be computerised (frankly there are tons of packages out there and councils provide training for them) and should be a doddle to print off for a parent.
I think when schools fight this (as ours did) it's because they really are concerned about letting parents truly understand how slowly (maybe even poorly) their children are progressing.