Hi...I completely understand. I think that as long as you are confident and happy with the people you are leaving her with, she'll be find. The most important thing you have to realize is that its' going to take time. She will adjust. She will start eating (maybe even better than she does at home--my daughter does). She will start napping there. I know it's hard and frustrating in the beginning, but she'll get used to it. Children thrive on routine.
I was a complete control freak when I first started leaving my little one at daycare. All I ever wanted (and still want) was to be a stay at home mom, which wasn't financially possible. I too cried at night, I cried when I left her. I cried when I got calls at work that she had a fever at daycare. It took me a good 4 months before I finally accepted the fact that I had to leave her in the care of others and that she would be ok.
My advice to you?--Just give it time. She'll be ok, and you might find that at this age she loves it. My daughter is the same age and I can see such positive changes in her from being around other children in a stimulating environment.
Hang in there. It will get better : )