I can relate to your situation, and I know it is a horrible feeling to drop your child off somewhere when she doesn't seem happy.
Will the daycare allow her to have a special blanket or stuffed animal from home? If so, try spraying a little of your perfume or her Dad's cologne on it. This was comforting to my daughter at naptime when she switched from a home daycare to daycare center.
Also, when we got into the car each morning, I would draw a heart on the back of one of her hands with a washable marker. She loved that -- not sure why exactly, but it helped. If she got out of the car and went in to daycare smiling, I drew a smiley face on the back of her other hand when we walked in to her room. Not only was she focused on smiling as we walked in to daycare, she wanted to go around her room showing everybody her hands as soon as she got into her class. This distracted her from the typical separation anxiety, and she made more little friends in her class.
Within a week or so she wasn't interested in the marker thing any more. She had, however, gotten used to going into daycare smiling and had made new friends. The whole daycare process was easier, and it eased my nervousness, too.
I'll keep your family in my prayers...