@mistakendreams,
start by saying hi every time you see people
actually - work up to every time
start with saying hi to 5 people people every day for a week
then up the numbers
some people have to ease into communication
but
bottom line - you have to talk to her directly - you have to say hi to her - you have to ask her what's up - and if, interested and free - you are the one who will have to ask her out