oh, never say someone's "too pretty" for you. that doesn't exist (I would hope this girl isn't too superficial!). keep at it, though... maybe she'll see something in you. some people don't date based on gender, you know? see something you like and just go for it. at the very least, you can get a great friendship out of it.
as for my friend and I, we don't talk much about our romantic lives (or lack thereof). she doesn't really mention girls, but I didn't either before I knew I was gay. when we're not at school, we communicate every day over facebook or texting or phone calls (something that neither of us do with any of our other friends, but this could mean anything). most of the signs I've gotten have been pretty inconclusive. the most glaring "signal" that I've noticed is the tension that I feel when we're together. like if we accidentally touch arms or something like that, I can feel her get nervous and pull away (we went to a drive in movie theater together and laid in the trunk of her car to see it; it was pretty cramped and it happened incessantly), but I don't know if she's trying not to lead me on or if she's nervous for the same reason I am, so I've spent the last 10 months or so really, really confused and conflicted.