If she is young enough, take her out and give her another year at home. If she is too old to not begin preK then try and make an arrangement with the school. Assuming you have spent lots of time trying to speak to your daughter to make sure there is nothing causing her upset. If it is the separation anxiety, try to organise with her teacher for you to take your daughter and stay in the classroom for the morning. Then your daughter can come home with you after being in the room for a morning. After a couple of days, sit outside the classroom where she can see you are still there. Then extend it to you move out of view for a small time - 2 mins increasing throughout the morning but always returning to view. As soon as you feel she knows you will keep returing for her, then see about leaving her for the morning promising to be back in a very short time. Once she is confident that you are always within reach, even if you are out of sight, she will begin to gain the confidence in her classmates and teacher for the support she needs until she does see you return for her. It will take a while but she needs to know you want her to be happy with school because you know how much fun it can be. But the most important thing is to make sure this child has not had to deal with anything that has caused her anxiety.
A thought which you might have already done - has she a special cuddly that can go along with her to school ? Will/does that make a difference ?
Also, is there one child who is friendly with your daughter and could come over for a play time with your daughter in her own environment where she is comfortable ? Trying to build up a friendship that can help her through the school day.
Pheewww! My son had such a hard time going to school. Just to let you know that the way you deal with this situation (as of being in a positive way) will later help her deal with every bit of separation anxiety. I think you should talk to the school psychologist and go with your gut.
There are two possibilities as to what is wrong.
(1) She is too immature to be in school. No harm done if you keep her home another year.
(2) Something at the school is upsetting her. If that turns out to be the case, change schools.
I'd consider taking her out, since it's only pre-K. She might simply not be ready. Gymboree, if they have them in your area, is a nice middle ground to adjust her to the idea of being around other kids, because the parent goes also. She can ground herself with the safety of your presence, while still learning about being near other kids. It might be a way to acclimate her, and to get her adjusted in a more gentle way to the idea that being with other kids and a teacher is a safe place.
i think you shud talk to her, may something is not going right with her in the school that why she does not like going there, also talk to her teacher and her very close friends that what wrong?.