did she has a boyfriend?

maybe she didn't love you ,but it doesn't prove that you change you determination!REMEMBER:support is my life !

are you attached?
If not, are you available?
If so, do I have the honor to after you?
haha~~~

If you are classmate, why don't she know you?
If you wish to talk with her, why not try? or ,you will lose her, and regret.
If i were you, i will observe her some time, and try to find her daily schedule, and find a chance to give her a hand. therefore making friends with her is reasonable

your gramma is completely wrong, you should type like this:
does she have a boyfriend ?
i've just known her name is chuah siew hui...
we are classmates, but she doesn't know me...
i have a crush on her and i do wanted to talk to her, but...
how can i start a friendship with her ?

Just start with 'hi' and smile.
If she didn't know you, then start to make her know you from tomorrow. Maybe she knows your name and knows such a guy in your class but just have no way and no time...