Originally Posted by
Sanctuary
It sounds like she might like you.
Just go up to her and say "hey". If you have nothing to say, comment on the situation/surroundings or compliment something about her. Don't just say she's pretty. Make it something genuine, like "That's a nice shirt, it really matches well with your shoes" or something. Though that's easier said than done. I guess the important part is that you don't come off as nervous cuz then she'll pick it up and get nervous too lol.
You say she lives right across the street? Why don't you ask if she wants to go bike riding with you some time - if you guys have bikes that is.