Ugh, that's rough. I remember when I was about 10 I went to girl scout camp. I had been looking forward to it for ages. There were 2 other girls from my troop. One of them really didn't like me so she told the other girl and our other tentmate that if they were friends with me, they couldn't be friends with her and she would make sure they regretted it. So I had no friends, and then she made them hide things in my bed and say that I stole them, so they could "find" them in my cot and get me in trouble. It was miserable and I was SOOOOO glad when it was time to go home. If it wasn't for her, I would have had a great time. I always loved church camp, and all the other summer things I did. Maybe if she toughs it out, she'll end up loving it?