Don't, Don't, Don't Bite your friends.

We had our first biting incident recently...  I went to pick up Amelia from school and the teacher informed me that she bit one of her classmates!  Since she bites me all the time, I knew it was only a matter of time before she wanted a new chew toy.  According to the crime scene report, the teacher was playing on the floor and had one of the kids in her lap.  Amelia also wanted to get in the teacher's lap but the other child did not want her there and proceeded to "shoo" her away with the waving of his arm.  Amelia did not like this behavior and took the victim's arm into her mouth and bit down.  No blood drawn, but the bite left a good mark.  I have to say, I'm glad she was on the delivering end and not the receiving end.  And she knows how to fight for what she wants.  Should I be proud?