Morning OP,
The reason why you believe she has had ADHD/ODD isn’t just down to last night is it?
This is will be day in day out, where arguments can happen over the smallest things.
You need to start keeping a diary, regarding the outbursts, behaviours, triggers, your actions. You also need to record her behaviour on your phone- this will have to be done in a way not to further antagonise you DD but it’s important that the professionals see behaviour. After 4 weeks of recording, make an appointment with the GP. You will probably have to wait a further 2 weeks for an appointment, so keep recording. That will give you 6 weeks of recorded behaviour but also bring along information as to how long this has been going on and any incidents that stand out. Inform the school that you will be contracting the GP about ADHD/ODD.
That’s your first step.
Second, do what’s necessary to make life easier for all of you regarding homework/evenings.
Many people don’t understand how utterly exhausting it is just to ask a child with adhd/odd to do their spelling homework for example. This could result in you having to ask 7/8 times over a half hour period and result in the child becoming upset and angry with you. So a task that may only take a few mins for most children, could be easily be half an hour of arguing. On just that one thing. Never mind, that they have to eat their dinner, have a bath etc.
So speak with the school. Agree any homework that comes home, you will assist your DD but if it causes arguments, you will back off. The School will soon wise up about what’s happening at home. Any work not completed, add a note to explain it wasn’t possible. If the school questions you further, show videos of homework incidents.
One thing you might find helpful, even though it will seem counterintuitive, is giving her more independence. Sometimes the mere presence of an adult can cause upset. Let her get ready by herself in the morning. Lay everything out for her, but let her get on with things without any instructions that she’d naturally want to resist. Now this may result in one or two late mornings. Inform the school of your plans, so they know what’s going on. If you come downstairs, and she’s still not ready etc DO NOT RUSH her. You will know that these transitions will most likely be the most stressful time for her and will result in a meltdown. Just take it easy and get her to school. If she’s 15 mins late walking into class, I guarantee she won’t want to be late the next day and she will be a little quicker.
Just think of ways you can guide her, with the minimal amount of direct instructions.
Eg, set everything up for her bath. Casually mention that’s her bath run, and leave her to it. Listen out for her etc. She is likely to go when she doesn’t feel pressure. If she leaves it too long and it gets cold. Then add more hot water and remind her that as it’s best to jump in as soon as a bath is ready.
Once in the pathway to a diagnosis there will be advice given on how to deal with the behaviours etc. This is why it’s important to get a diagnosis.
So start keeping the diary and speak to the school again.