You shouldn't let her do that! She might be tall, but that doesn't mean she is better than everyone else and gets to steal your food! If you can, try to stay away from her when she does that. Just because she was born taller, doesn't mean she has a natural superiority to others. Tell her to stop. And if that doesn't work, get a teacher involved if this happens in school. Don't let her push you around and don't let her guilt trip you, saying,"aww... Please? I'm your friend." If she tries to use being your friend as an advantage, I suggest stop being around her.