How do I handle dd9?!

[Hatade16]

I swear to god I'm dreading teenage years!!
Dd9 has started becoming best friends with a girl near us. Since doing so she's became so rude and disrespectful to me 😪 Literally answering back and not doing as I ask.

Tonight she was messing around before bed, trying to untangle some ear phones even though I had told her it was bed time 5 times. So I took them off her, and she smacked me. Iv sent her to bed, grounded her and took her iPad off her. I'm so angry!

I think I would strictly limit the time she sees this girl then. I would say firmly that she is picking up shocking behaviour from somewhere and so she won't be allowed to see her new friend anymore as she clearly thinks being rude is cool.