“Is childhood obesity a serious problem?”

It is a very serious problem. Not only will it have a significant adverse effect on her self esteem during her developmental years, it is the beginning of serious consequences to her body (strain on joints, opening the door for heart disease and diabetes). It is very important to take this very seriously, and I recommend finding a qualified bariatrician in your area to help. A good place to start is to go to: https://obesitymedicine.org/find-obesity-treatment/

Yes. Childhood obesity increases the risk of childhood diabetes. In addition, there are many issues associated with obesity in all persons. Mentally, if her friends make fun of her for her weight, she could have issues too.