My sister is 10. She weighs about *mod edit* pounds. She's been obsessed about losing weight for the last 6 months. We think someone made fun of her at school. A few days ago she was reading a book with my mom that was assigned in school. In the book one of the characters is stranded on an island and happens to say "well we can live for a week without food so long as we have water" and now my sister thinks she doesn't have to eat for a week. She hasn't eaten in 3 days and only has chewed gum and drank water.
She's afraid of eating foods that have iron because she doesn't want to get constipated like she used to. She also takes a laxative every night (her doctor prescribed this some time ago because she was having constipation problems). I think that the real reason she's afraid of getting constipated is because she thinks it will lead to weight gain.
Me and my mom are kind of at a loss. I feel so sick watching my sister hurt herself like this. My mom tries to convince her to eat but she cries out in defiance and refuses. She has a very strong will and doesn't budge on things. She doesn't really respect my mom. She kind of bosses her around and there is the implied threat that if my sister doesn't get her way she will have an aggressive temper tantrum on my mom so my mom doesn't like to force her.
Please give me some suggestion on what to or what not to do to fix this. I can't just sit by and watch my sister do this. My emotions are very angry about this and my instinct is to try to force or persuade her to eat but I know when someone like this is pressured they dig their heals in further.
My sisters father (not my father) feels the same as I do. He isn't over this week (he is on call for his job 24/7 every other week) but when he is I can tell he's angry at my sister too. He and my mom sit down and lecture my sister and she retorts rebuttals at every one of their statements or just tries to ignore them. Sometimes the atmosphere gets explosive with my sister being angrily defiant and my moms boyfriend being angry at my sister for "not being normal." I really don't know what to do. I know their efforts aren't working so we definitely need a different approach.