Ayu's Singing Voice..REAL?

Do you think she's holding out her 'real' voice? I was listening to some of her earlier songs & she sounds normal. (Not that she didn't sound normal to begin with but...) Do you think she over-nasals some songs? There are songs like 'YOU' where there is hardly any sweaks & there is 'Trust' where there is quite a few. So I don't know. Is she singing w/ her real voice or trying too hard to hit high notes so she sweaks to sound better? What do you think?

(Hope this makes sence...)