Help with 3 year old

[toots3]

I have a three year old daughter who is experiencing some anger issues at daycare.  She has resorted to biting, and scratching.  She is a very defiant and strong minded child.  She is also very smart for her age.  It seems (according to the daycare) that when she bites and scratches a lot of the time it is for no apparant reason.  And when she is not able to bite another child or the teacher, she bites herself.  She bites to the point that she leaves her entire set of teeth marked and it stays there for up to a week.  I have tried what seems like everything.  I have recently been having the center call me each time she bites and my husband or myself go there and take her out to the car and spank her.  I tell her that they are gonna call me and I am gonna come up there everytime and spank her.  She doesnt' want any children around her, she sits alone sometimes when I get there to pick her up.  This is breaking my heart.  I know she can be good because she is sometimes.  She can be the sweetest thing in the world and then boom she freaks.  Please help us.

[SL345]

Do you have any ideas about why she may be reacting this way? What precedes the biting? Is it only at daycare? How does she act when you bring her there? When you pick her up? What does she say about daycare? How does she handle anger in the rest of her life? I am against spanking children - violence teaches violence. However, consequences are appropriate (no snacks, no television, special toys go away for a day or two). Mostly, you need to talk to her firmly about her actions and try to find out what is bothering her.

[toots3]

I have no idea why she behaves this way.  The daycare says that she does it for no reason.  It is only at daycare.  She is fine on our way to daycare until we open the door and she steps in her room then she shuts down and doesnt' want anyone near her.  She is happy when I pick her up.  This is her 3rd daycare.  She really doesnt' talk about daycare.  She handles her anger aggressively.  I respect the fact that you don't agree with spanking, however I do.  I try to use it as a last resort, but we do spank.  Thank you for your caring.