Anorexia Tricks??

Ok so my beautiful friend has anorexia, at least I thought. I mean the girl has starved her self so bad that she is just bones at this point and she has lost so much of her hair. But the weird thing is she keeps losing weight but eating more. She has admitted she has a problem and isn’t doing better so it’s not like she’s recovering. I already know she’s abusing laxatives but I feel like she must have started something else to keep eating like she does but stay so skinny. Anyone have any ideas?