Student/Dependent Status

My daughter, who will be 19, is currently living and working in a different state and taking dance at a dance school 5 days a week 3 hours a day.  I do not believe the school is accredited, merely a dance company that teaches ballet.  Does this allow/prevent her from being considered a full time student?  If she is not considered a full time student, what does this do for my ability to claim her on my taxes?  Will she need to file her own taxes and not be claimed as a dependent?  She is still living at home when not in classes (Thanksgiving/Christmas/school breaks and summer).   Also, she was full time at home until August (first half of year she was still in high school).