As it looks as if the school may be "encouraging" you to move your Dd
I would self-report this thread and ask if MNHQ can move it to Education and amend the name so it reflects you are looking for help about a school disiplinary re uniform.
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She is 13/14?
On the food if she had reduced her activity yet maintained her input she should remain the same or gain. So unless she is on a growing spurt or sick imo the reason for the weight loss logically is the input.
Worry may have decreased her appetite or she lied to the doctors.
Agree various meal days. She can eat the breakfast as dinner or dinner as breakfast but the choices result in a healthy balanced combination.
Dont use the word diet as its used to describe reduction of body fat)
She gets up 1/2 hr earlier and she preps and eats something.
Lunch is from home. An advantage is the bully has to physically approach to observe her lunch box and comment. But more important your Dd is in charge of organising healthy food which she likes.
On the school
I would go in with the attitude there may be at least 2 meetings
First is a fact finding mission school present their case and proposed resolutions. You highlight your concerns and firm up what the school can do to resolve them.
You both agree on common outcomes or you need to discuss the proposal with Dd and get back to them
I would continue to leave Dd with the school and make it clear that moving her to a new school is not an option. Expeling her for not wearing a uniform (low level self-sabotage/self-harm?) is a non-runner if they wont expel the bullies for actively harming your Dd.
Points covered would include
Ask how the school will be managing her ongoing education needs while this is being resolved.
Dd sees the trouser rule as a shaming method which may result in outright school refusal. If you force the issue how are the school going to manage that scenario. (The school will have a policy on that process too)
Your stance has always been there are rules, everybody follows the rules and the school leads by example. You applied that principle to your older child expected the school to apply this to the bullies and will teach DD the same.
The uniform policy has a specific sequence of events so the school are currently acting outside the policy, what is that teaching your DD?
Bear with me on this one, if trousers, as a punishment, applies across the breach of school policy its indirect disability discrimination. Some children dont want to follow the rules. However a large group of those who breach multiple rules will have underlying learning and behaviour issues and cant follow the rules. Trousers become a "spot the child with additional needs" uniform.
If they bring in prior incidents to justify the skipped steps the punishment is not about rolling up the skirt but forcing your DD to be easily identifiable as a "problem/additional needs" girl.
Your DD has been bullied, she lost weight, she possibility has the start of an eating disorder, so her uniform no longer fits she rolled it up to keep it on. She should have said this to you but is this part if the mental distress?
You have fixed one element by fixing her skirt.
The school fix another by following the rules.
You need to have a serious discussion with your Dd on your punishments if she breaks the rule again. Outline these to prove you support the school applying the rules.
Take each of the other incident independant of the current uniform
When did it happen
Who was involved
What exactly is the allegation
Where is the policy detailing consequences
Why was the policy not applied
I would point out that you can not work with the school if the school fail to inform you. On these 'woulda coulda shoulda' but was not managed by the school at the time it was happening. Is the punishment for any a special uniform?
How did the prior incidents fit into the overall pattern of bullying and you seeking support for her?
I am assuming you asked the school to contact you as issues arise, why did the failure to communicate happen and how do "we fix it".
If DD was not in class and being bullied how did the school establish that she was safely "truancing" not on the way to A&E after a assault?
You adapt to what ever point is being raised.