To a Mother's Plea,
Ah...the fact that she is used to you in the classroom makes a lot of sense.
I would say that some 3 and 4 and 5 year olds are more than ready for school, others are not and it's like forcing a square peg into a round hole. It can be done, yes, but not easy. And it has NOTHING to do with how bright and curious the child is.
There are so many things you can do to teach a child informally at this age. In fact, pretty much everything taught to kids in school at this age can be learned in some other way at home or with friends.
School and formal classes are only one way to learn. Thing is, she will have 10 or 12 years of formal group education ahead of her--and this doesn't include university or formal skills training. More than likely these 10 to 12 years will be spent in the company of her teachers and peers, so she will have plenty of time to develop peer relationships and learn to learn in a group. She has plenty of time to learn to become independent from you.
There may be some other reasons why you feel like she really needs to be in school, and if so I think the sentiments expressed by Rotinhell hold true--tough it out and she probably will be fine.
My hope it that you think about why you are doing what you are doing. So many parents jump on the preschool bandwagon simply because everyone else is doing it or because they have a bright child, without really considering if this is the best thing or not. For some kids, the school environment is just out of sync with where they are at. And sometimes kids resent having to give up their less structured days, which given how short childhood seems to be, can you blame them???
Best of luck.