Student or Learner
I want to say one who has been pretending as a nice person. Finally her real face showed that others realised she is not as nice as she used to act.
Can I say:
Her inner self unveiled and shows she is not as kind as she has been acting.
I would say something like "Her 'real self' started to show through and we saw that she's not as nice as she appeared".
If you want to use "unveiled" then you need to say "... was unveiled" and you need to show what actions led to that unveiling. Things don't unveil themselves usually.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.