A.R.
My kids were biters & bitees, it cycles.
Couple things, teach her some sign language, just simple signs like more or drink or eat and it might help her communicate better and reduce the biting out of frustration.
For you daycare I highly recommend a technique called shadowing. If a child bites more than once in a day they become the caregiver's shadow - means they can't be out of arms reach for the remainder of the day. This helps the caregiver pick up on triggering behaviors/situations so they can prevent in the future as well as allowing the caregiver to intervene immediately to stop the behavior. It's the only technique that worked with my kids and the other kids in their classes. We were in 4 different daycares during the biting years (moved a few times) and the shadowing technique worked great, better than anything else any of the daycares tried.