How can a twelve year old girl become a singer?

If the girl already shows a reasonably pleasant-sounding voice; that has good pitch; adequate resonance (volume) somewhat above her age level , AND wants to learn to sing PROPERLY, that is :with correct vocal mechanics; good note-reading ability and willingness to accept a broad range of material . The age 12 is a good time to being. AND OF COURSE mature enough to understand that daily practise has to be done as said, than well go for it.