text: Just tell her it's not very nice. Don't put her down she already knows about her weight issue and doesn't feel good about herself, that is why she is getting her pleasure from other peoples pain. In some strange way, she feels better about herself when she points out someone elses flaws. It is a touchy situation, maybe the two of you could come up with things to do that involve more physical activity so that she may start shedding some of her extra pounds and feel better about herself. She really is sufferring, with low self esteem and self confidence. She needs to realize that she is worth more than her weight.