Yes, a girl can become a Girl Scout Junior. For Girl Scouts of the USA, to be a Girl Scout Junior, a girl must be in either grade 4 or grade 5 in school. pay the national membership dues, and agree...
For Girl Scouts of the USA, Girl Scout Juniors are grades 4 and 5 or about ages 9 and 10. Girl Scout Brownies are grades 2 and 3 or about ages 7 and 8.