Help me understand

Whomever thinks newborn is the worst. Have you been through 3s? Or have you ever had a horrible threenager? I would most definitely go through newborn stage with no sleep, sore boobs, pp hormones etc, than have to go through age 3. Like seriously.

Help me understand a serious threenager. She has an attitude like a witch. I swear she is bipolar. (Not judging that condition as I know it’s real). Literally a flip of a switch and he’s wicked witch of the west. When she don’t want to do something, she WONT do it. And it can be a simple thing of putting her clothes on. Or she think’s her underwear is falling down (which clearly is not). Any simple thing she throws a huge fit. To the point of scratching and kicking/hitting others or herself for that matter. Or even biting. There is NO reasoning with her. Don’t even mention gentle parenting as I don’t believe in it and it won’t even work with her. I try talking calmly to her and she just screams in my face. She does get time outs they work but then don’t. She will just sit there and scream. Has to be there for awhile to even calm down.

I CANT take this anymore. I don’t know what to do.

Add: I do have a 6yr old but she never acted this way.

Reply to Nia: yes I do put her in her room to calm down. That’s the only way she will. I don’t let the slamming doors or throwing things slide. Example today. She didn’t want to put her clothes on. Grandma called and wanted to take them to the park. I told her she had to have clothes on to go. Well she didn’t do it and she didn’t get to go. WW3 started and exploded. Idk how to handle her. It’s like satans spawn. And I don’t give her attention. I ignore it. But she just continues.

Reply to Ariana: no she does not. It’s all behavior related.