B.A.
Take a few deep breaths and let the stress go. And remember that for the next 20 years at least. The daycare workers have seen it before and will see it again. You just have to let her adjust, it only has been a week. It is a HUGE change for her since you are so bonded as a result of the breast feeding.
I would drop her off and point out something that will interest her, then turn and run. Do not make the goodbye a long thing. If you do you will teach her to cling to you thinking you will stay. Praise her for any and all positive things that happen during the day. Let her hear you tell others what a big girl she is going to day care with all the other big boys and girls. Good luck and don't forget the deep breaths, they will help center you.