@Yalie2011, my D was a NMF with a 2350 on her (old) SATs, top 5% in her class, and she had strong theatre credits including several semi-professional theatres. Most of her fellow Northwestern theatre class were like her. It’s unusual, but it’s not as unusual as you seem to think. It’s a big competitive world out there…
As others have said, your comments indicate you and the parents really would benefit from much more research, before you ask more questions. This is a good place to start.
For instance you write “One funny thing, you don’t have to have an undergrad degree to get into school of drama for graduate degree, as long as you have established yourself in theater world. That explains admissions of some celebrities.”. This is an example of your need to research more–It’s like saying that it’s a ‘funny thing’ that you don’t have to be pre-med in order to get into med school, or you don’t have to be a business major in order to get your MBA. This has nothing to do with being a ‘celebrity.’ Nearly all grad programs care about a lot of factors, especially including work and internship experience. But it’s way, way too early to talk about grad school when the student has very little experience or knowledge in what’s offered in undergrad and what his goals are. I would focus on that right now.