Teeth are NOT for biting!!

We have been having some "issues" at day-care and Avery has decided it best to vocalize herself when frustrated by biting. I have a very heavy heart regarding this whole situation b/c I feel like I have let her down as a parent b/c of something I did or didn't do. What did I do different from all my other friends who seem to have the perfect child and somehow I get the "angry" one who I feel like will grow up to be that kid who hates and despises their parents and will be a complete deviant. Every time I enter the day-care facility, I feel like I am carrying the burden of the scarlet letter right on my chest. I don't make eye contact with anyone and I secretly pray as I walk down that lonely corridor to my child's classroom that she had a good day. I know they gossip about me and say behind my back that I am a bad parent and that I have no right being a Mom. They treat me like I am stupid and I have been "told" that the newest director does not like Avery and wants her out. How does someone hate a child who is barely two and can't even speak for herself???? I hate every day that I send her to this "puppy mill-of-a-daycare" and can't wait for a time in our lives when I don't have to do it anymore. They all bite (some way more than others) and Avery still has a scar on her upper arm from another kid who drew blood over 4 weeks ago. My friend, Courtney, knows how much this bothers me and thought she would lend some friendly help. She sent Avery this book on Friday and we have read it already maybe 40 times. This is Avery reading it in the car on Friday when she got it. It is her favorite book and every time we get to the part that says "teeth are NOT for biting" Avery always shakes her little pointer finger and says "no, no Mommy". Will it stop her from biting? I have no idea but at least it is a start!! Thanks Court for the thoughtfulness and the encouragement that you always give me!!