3 year old troubles? Need advice ASAP

So I watch a little girl who is a little bit over 3. She constantly is screaming and crying. Constantly hitting others. She will walk right up and hit my 12 year old just because. She pinched and hits my 2 year old and constantly takes her stuff. She will even walk up and hit and try to kick myself.

I’ve done time outs taking. Ect you name it but in all my years of child care and raising my 12 year old my 11 year old and my 2 years old I’ve never ever dealt with these constant behaviors. The little girl will even kick my doors walls and window and tv’s .

She also likes to curse which is a big no no in my house.

Any one have suggestions or idea what on earth causes this behavio

!sarah! Yes I’ve spoke with the parents and they’re like oh trrrible twos still and I’m like no. She’s been this way and just getting worse since I’ve had her. I’ve been watching her at a year and a half. Her mom is expecting a baby next year but the behavior has been this way even before that. I try to be understanding but I feel like it’s not fair to my kids especially since they are homeschooled now. My middle child she is obsessed with I mean my kid can even move a inch with out her freaking out 😅. They try to be patient with her but they’re reaching their limits as well even my 2 year old. My 2 year old flipped out today bc she kept getting hit every time I turned. Away for a second