When Phases Collide

Question: what's worse than a teenager? Answer: a toddler who behaves like a teenager. That's where my younger daughter is now. She's 4 years old and recently came into her own, to put it super nicely. For the last 4 years years, she was the sweetest and quietest little girl. And then, all of a sudden, she's calling us poopoo heads and telling us every 5 minutes how she hates us. That's followed by crying/screaming capable of making one's head burst and clinging onto my leg for dear life. Then she'll completely calm down like nothing happened, and then 10 minutes later, boom, it starts all over again. Her new nickname is Jekyll/Hyde depending on the cycle she's in. Again, someone please tell me it's just a phase.

So yesterday in the car, she was in that mood again and muttered over and over again,"Hmm. I don't like nobody. Hmm. I don't like nobody..."

Her brother responded,"What? You don't like your big fat butt?"