My 7 yr old weight is 22.0 kg. what per centile does she rank? her head circumference is 53 cm. what percentile does she rank? is this normal?

Without more information no reasoned answer is possible. You are welcome to start over and include the kids measured height so the answer can be provided.

Here are the growth charts pediatricians use. https://www.cdc.gov/growthcharts/clinical_charts.htm#Set1 For your daughter, this chart may be helpful: https://www.cdc.gov/growthcharts/data/set1clinical/cj41c022.pdf Best wishes.