DD 3.4 TOTAL NIGHTMARE SINCE STARTING PRESCHOOL HELP!!

[tiswas]

Hello everyone, just after some advice, my dd 3.4 has totally changed since starting preschool. She has been to nursery from the age of 10 months then progressed to play school until 3. No problems, whats so ever, has always been a really easy child, very chatty and pleasant. She started preschool about 3 months ago, 3 mornings a week, where the kids obviosly older and she's in a bigger class, although there's loads of teachers there. But she has just totally changed, suddenly becoming very angry all the time, really pushing the boundaries constantly, she has even had a massive tantrum at school to a point where she has kicked chairs over and hit the teacher.
I have know idea where this is all coming from, its such a shock, the preschool seems a really good one, well managed and well disciplined etc.
Nothing at home has changed, she's got a good home environment where me and ds are happy, its not like she's around shouting and argueing all the time. We never even had the terrible 2's with her, she was always so easy to please and now everythings just a trauma!

Please help !!!

Hio tiswas (like the name)
My friend had a problem like this with her ds,it turned out he was being picked on at nursery by a some other kids,just subtle things like pinching and not letting him join in.It took my friend ages to sort it as the school always denied anything was going on .She actually witnessed it herself when she went to read to the class one day and saw her son being pinched.
I'd have a word with the school and maybe go and help out one day to check out the dynamics of the class.

Thanks for that ggirl, I have spoken to them and they are going to watch her more carefully, I have asked her what's making her angry she does says you never let me do want I wanT to do. She suddenly acquired a very strong willed mind to the extreme, its very hard work.