My 3.5 yo DD has started in a new pre school, she was in a private nursery for 2 years beforehand. She has been described as very confident and highly intelligent. My DH and I obviously love her but we do find her very hard work and since our DS was born in April her behaviour has become very difficult for us, we have both been reduced to tears on occasion. Its a bit beyond the usual toddler meltdowns, she often singles people out and rejects them. Her Great Grandmother is often on the receiving end of her disdain and in groups of children I have observed she tries to get rid of the boys for example and only wants to play with the girls. She'll be mean and tell people to go away, she doesn't like them etc. She's only been in her new pre school 1 week and I've just had the second serious conversation about her already. They said she's been hit in the head because she snatched a toy and told a child she didn't want to play with them. The teacher said "we are monitoring her and I don't want to make a statement like there's something going on, but..." this has really thrown me tbh. The first incident last week my DD had apparently kicked a teacher. When I was told about it I reassured them they wouldn't get any challenge from me on how to manage it, they are professionals after all but I'm starting to freak out they think there is something wrong with her.
We were abroad this summer and I was watching her interact with other kids and she's very dominant, telling everyone to be quiet and do what she wants basically.
For context she has not shown any jealousy towards the new sibling, quite the opposite. She's extremely intense with him and thinks she is his mum and sometimes trys to insist she feeds him / holds him etc and I'm not allowed, I humour her because she is very loving towards him.
Has anyone had an extremely domineering toddler that has grown out of it? If so what techniques did you use to make them chill out a bit?