You have more patience than me, I would have told the school no changes after the first pony tail objection, definitely after the plaits complaint!
Some of these rules are not thought out, I accidentally called a little boy about seven years old "she" (he didn't hear me thankfully) when chatting to his Mum. She said it happened all the time, he had soft twist afro hair, so a biracial child with natural hair, the school had a rule of pony tails and insisted he wear one too, even though his style was appropriate for his hair and he was the only child put in this position. The Mum said they were absolutely not cutting his hair!
Why does it matter that other girls are complaining about another girl's style... shouldn't they be telling the girls not to complain about irrelevant things, not to comment on the way another child looks and to be thoughtful. Also hair tied back is not the same as hair down, hygiene, safety, style, everything! Shouldn't they be dealing with the complaining girls and addressing attitudes rather than asking a child who is following the rules to change?
The styles mentioned are lovely, but are you expected to do a full wedding bride style on a child every morning?! I can barely get a brush through mine:)
Why are they objecting the the two top buns? Why am I so bothered when this isn't my child... this does bother me though! It seems unfairly directed at one child and they are repeatedly hassling you, I don't like it
I'd go for a low bun, or a plait if you can do them (I can't so they could forget that from me!) or whatever you want. If a child shows up clean, cared for and with their clothes on not inside out, I call that a success!
Yes send a note saying these are options according to the rules, you are attempting to accommodate the repeated requests but would prefer your child is not disturbed by this any more and perhaps it would be more helpful to discuss good manners with children complaining and singling out another child, or pulling hair!
Or if you're not as randomly bothered by this as I am, I'll write it for you if you want:)