There is a most helpful article on Zenit regarding a request from some 10 year old girls to receive the sacrament of Confirmation in a diocese where the policy is to delay Confirmation until the "sophomore year" that is the second year of College or High School, I think, so about 13-15 years old. (Could someone from the States clarify this?)
Fr McNamara refers to a letter from the Congregation of Divine Worship to an English-speaking bishop: protocol No. 2607/98/L, published in Notitiae 1999, pages 537-540. In response to a similar case, the letter points to the basic principle in canon law that pastors may not refuse the sacraments to the faithful who ask for them and are properly disposed. The Bishop was directed to confirm the girl.