MIK-QUEGirls Seamless Training Bras Adjustable Straps Sports Bras 8-10,10-12,12-14

is there a clasp in the back？

The size chart does not make sense, is it really in inches? My daughter has a 30 inch bust, 26 inch waist, weights 83 lbs., what size should she wear?

Does this bra covers full breast?

These reviews & questions made me way more confused. people talk about a 11-12 sz which doesn’t exist. sml are my choices. what side for a 11 yr?