Second this!
I am ND and after being at my wits end with my youngest after feeling accomplished with my older two I was lost.
Aside from awaiting the results of her ASD assessment, I have hammered down on choices. My SIL is an ABA and provided some much needed help recently. Even basic choices ‘are you hungry? Yes or no?’ Allow the brain to process so much easier, so closed questions/choices. Open questions are so hard and consequences hard to fathom. As an example for your situation (but too far ahead for just starting out with ‘choices’)
‘this is your cheese, would you like to put it on yourself? Yes or no?’
’I hear you want more cheese but you’ve run out, when you can respond calmly/quietly we can talk about more cheese’
’do you want friend to come on Saturday? Yes or no?’
’we need to make sure we use our calm/quiet voice to talk to eachother’
’when you have had enough to eat of your meal then we can talk about friend coming over’
It’s really hard but you’re going to have to put in some hard work that will be tiring and you’ll likely lose sleep and feel like you’re getting nowhere, but with consistency and integrating tools like this you will improve the chances of reducing the emotional distress she is experiencing as well as your own.
You CAN do it and it is in hers and your best interests to be consistent ♥️