Why did boys bully her? she was soooooooooo pretty! don't you think?

kristina calco was bullied in school by boys. they called her ugly and fat every day. because of that, she committed suicide. i just don't get how she was bullied or called ugly, boys on the internet right now are saying how she was so beautiful. don't you think she is beautiful? and if you don't know her google her and you'll see her picture.