If you still have a couple of years, there might be time to improve your (and her) involvement in the Sikh community, which would maybe help getting endorsement for the school application? Also maybe chat with a couple of parents of kids at that school, and get a feeling for what they want to see to feel a kid will fit in. I know it's a Sikh requirement, but I find it hard to believe your daughter's secondary school admission would depend on her haircut from birth!
I don’t think the endorsement from the Sikh temple is too much of an issue, like I said they know my family, my step-grandmother goes to temple everyday and is well in with the relevant people.
I know it sounds crazy to someone who isn’t Sikh, but hair really is a big deal in our culture, it’s why I haven’t let hers be cut, my grandmother would be spinning in her grave (if she wasn’t cremated), it’s actually a question they ask on the school admissions form:
Yes / No I confirm that the child named above is Keshadhari (has uncut hair).
But in all honesty even if she did get in, it’s not an ideal situation at all, it will take at least an hour for her to get there.
Seriously, how have the local council let things get this shit that people have to contemplate things like this? Fucking Tories