My daughter wants to lose weight but I think she is a healthy weight already well at least she looks it she is 10 yrs 142cm tall and weights 7.7 stone?

BMI is 24.1. Which is at about 96 percentile for her age, above 25 is over weight, above 30 is obesity. Need to watch her calories, avoid fast food and sweets as as much as you can & increase physical activity. Check these links For height and weight http://www.cdc.gov/growthcharts/data/set2clinical/cj41c072.pdf For BMI http://www.cdc.gov/growthcharts/data/set1clinical/cj41l024.pdf Remember 1 stone = 6.35 kgs.