Originally Posted by TwinKristi:
Absolutely!! I felt awful when my DS bit and surely didn't make light of it. He never broke skin but got close. I understand your worry about the new family and wanting to have a plan in place. If she's a bully in general she may need a harsh punishment to get this point across. Also be up front with the victim's family that you haven't had to deal with this before and want to ensure their child's safety and well-being but will devise a strategy to deal with this!
Good luck! At 3.5 I think that's old enough to know better and probably a firm discussion will help everyone. As the "youngest" sibling she probably gets a lot of excuses for her behavior at home. My youngest before the baby wasn't a biter but he definitely has a very spoiled personality! 
That's my thinking...3 (almost 4) is a bit old to be biting simply out of frustration. I completely understand it in non-verbal littles, but this is a new one for me!