well, get her to come to singapore to study (as a valid student
pass holder), afterwhich apply for employment pass
(type Q1/Q2/P1/P2) so she can work here.
If she's here working (using work permit) better
dont try anything funny.
If you 2 get married without MOM's (ministry of manpower)
permission, she would be banned from coming to singapore for life.
No kidding.
Lastly, if u're well to-do, marry her and apply PR for her,
afterwhich she can get citizenship in singapore.
note: employment pass = skilled or professional workers (eg. system
analyst/enginners/accountant/.......)
work permit = unskilled workers (factory
worker/packer/waitress.....)