I agree with what the other moms have said about the teachers not paying attention to your daughter for two hours. If you didn't notice it getting better throughout the day yesterday or if you didn't already talk to the director, I would!
My daughter was three when she switched from home daycare to a center, and her adjustment was extremely difficult. It got to the point where she didn't want to go to bed at night because she knew she would have to go to school the next day. When she wasn't in school and we'd drive by her school, she would start to cry in the most heart-wrenching way b/c she thought we were taking her to school. Of course, all of these things made her tranisition difficult and stressful for me and my husband too! Hang in there, and things will get better. However, if you're not reassured about your daughter's wellbeing, she'll pick up on that and will have that much more difficulty adjusting. I talked to our daycare's owners about some concerns I was having about safety, and they did a great job explaining to me how things work, etc. It made me feel a lot better, and at least I knew that by keeping my daughter in there until she adjusted was the right thing to do.
It took about six weeks for my daughter to adjust. It may not be that long for you since your daughter is much younger than mine was. You'd never know now that my daughter ever didn't like going to school. Now, when we tell her that the next day is a school day, she cheers. She has lots of friends and really likes her teachers.
One last thing, at the time she was in daycare and going through that adjustment, I would have loved to have taken her out, but I also had to work for financial reasons. However, I now stay home with the kids (I still send my daughter to her daycare two days a week b/c it's also a "preschool"). Point being, you never know what could happen, so don't lose hope!