My sister is always complaining about how bad she looks :p?

[kaitlyn]

Lately my 11 year old sister is always complaining that she's fat and ugly when she isn't. She's actually really small for her age. She's not going anorexic, but it's just constantly: I'm so ugly! I look horrible! I'm sooo fat! It's gotten to the point where her friends (and mine) are starting to get sick of it. We can't even put a picture of her on fb without her whining about how bad shee looks. I'm starting to think that if she keeps this up, no one's gonna want to hang out with her. So how do I get her to stop? Thanks