see that's tough. Cause it's so great to be their friend, if you lost that by saying you wanted more, it would be the worst. well, the worst next to not saying how you feel...and what if's start...self doubt....
it's a mess. I say go for it. I mean really? Why have that ache in your heart? Why look back on it with regret? trying feels a lot better cause if she doesn't like you that way but is a good friend, then she will still be there, and if she likes you back that way, then awesome, right?!
if she doesn't like you that way and acts weird after, then move on knowing she isn't worth it