While biting is normal for kids at this age, it's very distressing for everyone involved. I found a link to a decent article on kids biting in child care. The most important thing is to try to figure out why she's biting so the staff can intervene appropriately. What time of day? What happened right before? Sometimes kids bite when they are hungry or overtired. I had a little boy in my class once who bit when he wanted to play with another child but didn't know how to enter the play - he was frustrated, but it was a very specific frustration that took a while for us to figure out. When you figure out why it is happening, you can put safeguards into place to prevent the behavior. If it happens at a certain time of day because she is over tired, if the teachers separate her from the other kids around that time and give her some down time that could solve the problem. If she's hungry and it's not lunch or snack time, maybe they can keep some crackers on hand.
One little girl that I knew liked having a cold, wet paper towel to suck on to help her remember not to bite. For her, biting had more to do with the sensory input and the paper towel helped her tremendously. If the child care program has access to the book "Prime Times" by Greenman and Stonehouse, there is a lot of helpful information for programs, including a chart for tracking when biting occurs.
It is a phase and with loving guidance, it will pass. It sounds like you and the program are already on the right track to helping your daughter through this stage. Good luck!
Article - http://pediatrics.about.com/od/weeklyquestion/a/1106_biti...