Do it!
If you sense a strong emotional bond with this girl, Don't be afraid to go out on a limb and tell her how you feel.
*BUT* Always be weary of the answer your NOT looking for. It's still there.
*ALSO* Remember that girls are a lot different than guys, They appreciate the little things we say and do. If you remember that, Your in for a smooth ride.
I wish you the best of luck!