In general, girls sizes are shorter than Junior sizes. Most girls who fit a G, G10, or G12 should be able to fit a junior XS in tops. Measure your bust under your arms, around the fullest part of your bust. I took my measurements but they don't fit your chart. Junior sizing will have a bust, and girls will not.
Girls also tend to be shorter than juniors.
Our sizing chart explains these differences very clearly. As a general rule, most girls who fit a G, G10 or G12 should be able to wear a junior XS in tops. A.Junior sizes do not exactly line up to women's sizes. But, if you are trying to get close, use the junior number lower than the women's size you are trying to match. For example, a women's six would most closely resemble a junior 5.