My daughter is being hurt at her preschool on a daily basis and I want to report it?

This little girl "E" at my daughter's school has been scratching, hitting and biting my daughter. It's gone on for the last couple weeks but my daughter said she had been telling her teachers so I was confident it was being handled because usually they're pretty good about putting a stop to that. This past week, Monday and Tuesday she had said she had gotten scratched so Wednesday I talked to her teacher and said this is really getting ridiculous, you need to stop this. The teacher seemed surprised to hear about the situation. Wednesday night my daughter complained again about being hit and scratched and I checked her out and she had 2-3 scratches which she attributed all to "E". Thursday when I took her to school I again asked the teacher to please keep an eye out. Thursday when I picked her up, they said my daughter caused a huge disturbance at naptime and was screaming. They then finally told me my daughter said the other little girl had come over during naptime and bitten her and in self defense she had pinched the other little girl, but since my daughter wouldn't show them where she was bitten, they didn't believe her. I took my daughter home and she told me she was bitten not once, but THREE times and pointed to her arms where there were obviously bite marks. I asked her why she wasn't telling her teachers every time this happened. She admitted that the daycare director herself had told her that telling is tattling and she needed to not do it anymore, and big girls just deal with it. I was LIVID because she needs to be able to tell her teachers not just in this kind of instance but if something more serious was happening. Friday morning, I pulled her teacher aside and said I'm really pissed off, here's what she told me. The teacher grew defensive and said they tell the kids not to tattle because otherwise they couldn't read a single book without kids complaining. She said she would reexplain the difference between telling and tattling to my daughter. I said no, you will not. You will pull her aside and tell her that she can come to you when she's in trouble because clearly she's taking the tattling thing too literally and not understanding, and it's ridiculous to leave it up to a 4 year old to decide. Friday after work I went out and my fiance picked her up. When I called to say I was on my way home, he was upset because attached to the sign out sheet was a disciplinary letter saying that our daughter was being awful the last 2 days at naptime screaming and disturbing the other childrena nd that kind of behavior was not going to be allowed. And in her cubby, hidden between artwork, was an incident report that she had been scratched. Her skin was open and bloody with no bandage and she had a very fresh bite mark that was not in the report. I examined her when I got home and she had 3 bite marks, 8 scratches and 4 fresh bruises, including 2 on her back. We are taking her out of the preschool but I'm curious about pressing assault charges and reporting them to the state. Who would the charges be against, the little girl's parents, or the teachers that let it happen? I callled a teacher in a different room that I'm friends with and "E" has a known behavioral problem and they've talked to her parents numerous times without removing her, so they are being very negligent here.