Please help. My 3 year old keeps waking up at 2:30am and won’t go back to sleep until like 6:30.

Can she articulate what makes her scream in such a way? Like is she scared of the dark?
Might be the time to get a doctors recommendation. If you’re not getting good sleep, that’s really bad for your mental health.

As the above post said is there something underlying that is keeping them up?

What’s sleep schedule like - do they need slightly less sleep?

Hmm, I hope it gets better! Do you think something is triggering her sleep?

Has she just gone 3?

What time does she wake for the day, does she still nap and when's bedtime?

First wake: Put her in bed/lay her down. Say “it’s still night time we need to stay calm and go back to sleep. I love you goodnight

If she screams you go back in lay her down “are you screaming because you’re scared. Or sleepy?”
If she’s scared you ask her if she wants you to read a short book.

If she’s still not asleep you do same as the third. Lay her down. Say you love her and leave the room.
Repeat this untill she’s asleep.

My 3yo was on a 7-7:30pm asleep 7am awake.
He had a week ish where he’d wake crying and shouting I did the above and it worked for him

My daughter was the same but she has autism , but she used to take a nap around 5pm everyday for an hour and now she doesn’t take a nap because if she does she will be awake all night and do the same , if she takes a nap needs to be around 1/2 pm but she just doesn’t want to

At 3 they develops quite a lot of fears so she might need a lot of reinsurance. If cosleeping is an option I would just do that. In our house we always protected our sleep and emotional comfort at night. If she is scared of something it's more than normal to not want to be alone (can you imagine being in a place where you are so scared and being left alone ?). Cosleeping would give her a safe place being comforted and you would just sleep and feel better.