She's been getting more and more rude and full of terrible attitude lately, speaking to DH, me and her siblings like dirt.
This morning was the final straw and DH took her phone off her until she can speak to us decently.
She is now having a screaming tantrum in her room, it's been going on, on and off, for 5 hours. She is also shouting horrible stuff at DH and I.
I'm at my wits end 