Tantrum's?

Okay, this isn't the first child I have raised, but she is my first biological child. My sisters kids are who I've helped raise in the past/currently. I've always been great with children/babies and I'm just.... flabbergasted when it comes to my little girl.

My daughter, Elise, will be two in April. She's sassy and spunky and funny and can be very very loving and sweet. But here in the last month, maybe two, she has started having the most awful fits. I know that the Terrible Two's are very real, but these take the cake! She will scream as loud as she possibly can, flail around, and even sometimes try to hurt herself or others. If I even try to stop the fit before it happens with a distraction or try to redirect her energy, she is worse.

I have brought this issue up to 2 out of 4 pediatrician's at a couple appointments and they tell me to keep doing what I am doing, reiterate boundaries, and to stay calm. They keep telling me that this is normal and will pass. That's all well and good, but I am losing t Mama's mind right now.

Due to issues with my sister's decision making skills, (🙄) I am now not only responsible for my daughter, but her three kids as well. So I know that the change in attention/dynamic is a huge factor. Competing with a 6 year old girl, a 5 year old boy, and an almost 9 months old girl has got to be stressful.

I do not have custody of my sister's children, but watch them for my parents the majority of the week. I make sure to set aside time for each child individually to make sure no one is upset or feeling left out.

What can I do to help my daughter not potentially hurt herself or others?! I'm at my wit's end and just want her and my nieces and nephew to be happy. Any tips and tricks/advice are greatly appreciated and welcomed. If you've made it this far, thank you so much.