How long is she at daycare during the day? Did you go straight to full day, every day daycare? Does your daycare offer hourly care? Perhaps you could just take her for a few hours a day, at least until she gets used to it.
I'm sure she will get used to it. We put my daughter in daycare when she was about 3 months old. Just recently when she was 15 months old, she moved up to a toddler room with new caregivers. For the first few days she would get upset when I left, but now she doesn't get upset as much. She's gotten to know everyone in that room and is ok with it.
Also, all kids get upset about going to daycare whether they've been going since they were an infant or when they are older. They will get used to it and realize that you are coming back for them!