To answer your question as best as I can, the two members who joined in 89 were not of the original group that formed in 98.  The 89 girls joined the group in 2002 and 2003, making them of young adolescent ages.  Brittany who was the 11 year old in 98 was the youngest member of the original group.  Perchance by teen depresion, what is meant is, 'tween' depression?...any other questions?