What am I supposed to do?!!!!

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This is about my daughter's nursery.She started going recently,3 days a week.Now new problem is she does not want to go.Very natural,I agree.But she is not letting me sleep properly at nights.Suddenly she starts crying at night.I have talked to the ladies at the nursery and I can see that they are all very caring.Last night she was so terrified that I will take her to the nursery in the morning that she did not sleep well at all.obviously,I could not sleep properly either.So anyway,today I just told her that if she does not go,then she is a bad girl and that I will not buy her new dresses,etc.She still did not want to go.How do you deal with a kid that does not want to go?It is still the initial days, and she needs more time to adjust.I can see that.But in the meantime,how do I make her accept that this is going to be the routine from now on?that she has to go to nursery without mummy staying near her all the while she is there?Please tell me how to deal with this?Should I use positive reinforcements like giving her a special treat after nursery?I already do that-sometimes her favourite juice or a chocolate.I did not really know what to do today when she started crying at home,saying she did not want to go.After trying to pacify her with all my means,I got so exasperated that I gave her one slap on the back to make her stop crying.She would just not listen when I told her softly.Please,any experienced parents here,please do tell me how to deal with this situation?My daughter is by nature,stubborn and once she decides that she is going to do something/not going to do something,that's it.No amount of convincing/treats will budge her.I am really really at the end of my tether.Please do share your experiences and suggestions,friends.Looking forward eagerly to reading your responses.