gingerbreadhouse

Howdy, I am a brand new school nurse and have a 6th grader with PDD who is extremely obese. He's put on 30 pounds since October, the school staff are concerned, and he is reporting that his knees hurt going up and down the stairs and it is taking him a while when he has to change classes. Mom refuses to acknowledge a problem and basically said to mind my own business, and that it does not impact him educationally. My director is pushing me to have a meeting to address these issues with the parent, but I am very uncomfortable doing so given how resistant she is. His teachers also say he smells, especially when it is warm out. I have not noticed an odour but this has been reported by various teachers. How concerned should I be and how should I address these issues. Would a report to Child Protective Services be appropriate.