It will most likely be better for Dani to join T-ara in December... or even 2 or 3 months later.
A 14 years old... is really too young to be added in a Group with 3 years and more of experience.
When she was scouted, she had no intention of joining this field, she had no experience in acting, dancing or singing. She better train more and learn more before joining T-ara, to get to catch up.
Hope the best for her, Areum, CCM and T-ara