here's a good suggestion.
next time you see her... before you get a chance to think and start getting nervous. IMMEDIATELY walk up to say hi... things will progress naturally
I know a lot of girls who like spontaneity...so the Second you see her, say something to her and you won't regret.
The way some girls see it, if you've been in her proximity for a while already and walk up to her, she might have this alarm called "stalker alert" which can blow things away...