My son started his nursery when my maid took her annual leave. I brought him to school and he could not stop crying. When my maid returned I asked her to take him to school. And surprise surprise - he did not cry at all when my maid left him at school. The teachers said that this happened to many children.
My son was close to the maid as well but after all there are differences between maid and mother.
So if you have a maid, you can try this way but of course you will need to keep explaining to your child that going to school is good to her.
Agree...my situation is almost the same. Everytime when I'm with my daughter, she'll be much more naughty or always crys even I never spoil her (at least I think I didn't). They really can sense the difference between mother & maid!
If you don't have a maid, try ask somebody like your sister or your husband to go school with him. It'll be much better I think!