I would get her excited about going to daycare...however, maybe calling it school or somet other special name for it. Give her a picture book with pictures of you and her in it so if she gets sad she could look at the pics. Make sure she has something that comforts her with her, familiar things will help.
This is another thought, is there someone else that could drop her off at daycare in your place? I have known mothers who have the dad or other family member drop the kids off at daycare and find that its easier.
Don't drag on in the car about going to daycare, get her up in the morning and tell her that she needs to get ready for the day, you go to school and mommy goes to work, you will have a lot of fun with the other kids, playing, laughing, learning, arts/crafts, etc. I would stay away from doing a surprise drop in with your daughter already there, if she sees you it will make it worse, wait until you know she is extremely comfortable being at daycare. YOu could call and check in on her throughout the day. Good luck, I know its hard, my 15 month old cries when I drop him off, but before I even get out hte door is fine.