Models face becomes distorted When animated

I have a model whose face gets distorted whenever I import her into unity and animate her. The problem is, is that she has 3 different meshes, and the face happens to be separate from the body. I’m assuming this because her lower jaw is missing if you don’t add in some extra bones. However that doesn’t work so well either because her face kinda wobbles around instead. Is there a way to get around this and keep her face intact??:spin: