but also bear in mind that children who have experienced trauma can present in a very similar way to a child on the autistic spectrum.
My take on the phone/screens situation would be.
It is very bad for aperson's health to spend too long on screens, use them too late at night etc
Because you are her mother, your job is to keep her safe.
She has shown that she hasn't been able to manage her use of screens healthily herself, so you need to do this for her to keep her safe and healthy. As there has been so much fuss over this recently and both you and she have ended up getting hurt when it is time for her to stop using a screen, the only safe thing you can do at the moment is take away all screens.
Then, give her the opportunity to show that she can responsibly turn her phone/tablet over to you after a set period.
So you might say you are giving her an opportunity to manage time on phones/screen whatever on Saturday.
You will give her the phone/screen at 10:00am for one hour (set timer) When the time stops, she can practice handng over the phine to you without a fuss and you will go out together for brunch/coffee whatever ( bonding time).
If she gives the phone back to you without a fuss, you will allow her another time to practice managing time on Sunday ( and then again on Monday, Tuesday Wednesday etc - you set when and how long she gets the phone for. Keep it an hour (or even less on week days).
Even if she does make a fuss, still try and go out for the treat as that is about spending nice time together not reward and punishment.
Explain before hand, if there is any fuss or problem about handing the phone in at the end of the hour then you will need to leave some time before you can allow her to practice managing her time on a screen again.
Both you and she have been through an extremely traumatic time recently and both of you have been trying to manage a difficult and manipulative relationship with your mum.
She needs time to adjust. She is trying to manipulate you al lot at the moment. try not to get bothered by it other than pointing out the natural consequence.
DD " Well I'm not going to school tomorrow"
You " Well you will end up getting very behind with your learning."
DD "I don't care".
You "I'm wondering if you are quite angry with me for making this change in our lives. I know it feels horrible right now and I'm sorry you are hurting about it but I did it to keep us safe. Hurting yourself by not going to school isn't going to make it better though."
It is really hard to do though!!