hi friend, my son is not as old as your daughter but I did work as a lead teacher in a t-k (4s) classroom for two years and what I can tell you is cutting out screen time helps so much. I know that that sounds like what is trendy right now, etc. but at home if you just spend the whole day, no electronics or TV and just continue to correct her it will get better. sending you all my love and positive energy!
Art therapy might be good for her
Calm down jars, minimal or no screen time, limit sugar if she has any, lots of outside time to burn off energy. I don’t know these are some things that have worked with my oldest (he’s nearly 3 but my sister and HV suspect he has autism)
Tbh I know you said you’ve said you and your boyfriend has tried almost everything but I feel like she just needs connection . I don’t know why I just do . Maybe do something different with her . A change of scenery , something like that . Plan a little trip doesn’t even have to be big . Find a nice park in a different city and do a picnic with her . Just make it about her . Tell her how much you love her and that what is best for everyone is for her to try to calm down whenever she gets upset . Just talk to her. Have a heart to heart. I think that would really help.
Get her properly diagnosed with a medical provider of YOUR choosing. Ultimately, discipline starts in the home, and you seem to be at a loss. Get her some behavioral therapy and research as much as you can. There has to be a reason why she's acting this way.
I worked with kids with autism. Not saying your child has it but it may be nice to figure out her triggers and ways to de escalate when she is like that. Have a space where she can re regulate at school and at home.
Pls take my advice with a grain of salt 😅 But I would recommend (you the parents not your daughter yet)watching the show Bluey as stupid as that sounds. Leading by example is the easiest way for any kid to learn. But if she also has sensor needs find out what things! Like a spiny chair, dark and quiet space, full body compression blanket, etc!
As Monica said, she needs a diagnosis from a doctor. Schools find kids eligible under certain criteria but school cannot diagnose. You are going to want to go to your pediatrician to talk about resources and diagnosis.
Does she have adhd? Is she autistic? Have you considered getting her help through therapy?