I would suggest you don't turn food into a big deal, and avoid any further confrontation. Make sure you spend lots of quality time doing energetic things which will take her mind off things that aren't going to plan and will also stimulate her appetite. I was a very skinny kid and ate very little for a short period a few years ago ( probably about age 11) not because there was anything wrong but simply because for some reason I just couldn't face much food and dinner made me want to hurl ( not through any weight worry issues just because it did). Once my periods appeared that seemed to go, so I'm wondering if any medical person here knows of any hormonal reason this might be happening and it might be unlinked to any bullying issues. I hope everything goes well for you all xx