This probably doesn't have any bearing on your present situation, however, something I have done with all of mine as puppies is:
When I give treats, I get on the floor. I make a game of it. Just an example of what exactly I do is to shoot the treats with my finger and she runs over to them. She likes to play with them first. She comes to sit between my knees at this point. I pick them up and toss them in the air a little and tell her I'm going to get them. I have my face right next to hers. I pick the treats up and I hug her, give her a kiss on the side of the face. It's become a game and she likes to play this game. The point of all of this is to keep her from being protective of food or toys and know that I will not take anything from her ever and she knows that I will give it back. I have always trained mine this way and I never have to worry about face or hand biting or over-protectiveness of food or toys. This is just something you might keep in mind for the future.
