I am posting as a step mum so please don’t flame me!!
I have never had this with my own kids.
DSD1 is 13 and this weekend has been a bit hellish.
She is just blatantly rufusing to do things. For example we were at the beach and she refused to sit on the blanket so was covered in sand. We all washed our feet off at the tap and she point blank refused.
DH then made her put her feet in a bag on the way home, he was going to not do that and just get her to vacuum the sand from his car but he thinks she would have refused to do that too.
He took her phone from her (we pay for it so we feel this is ok) and then she was messaging her Mum from her sisters phone who was colluding with the girls telling them they should make an excuse to be dropped Home early today.
Several more times in the evening she refused to do as asked. I had a chat with her and asked her if everything was ok, she wanted to be here etc and she opened up to me a bit but there was nothing she disliked about being here.
We are running out of ideas of how to deal with this? What do others do? 