If you like her that much ~ and she seems to like you ~ and you are old enough and / or have parental blessing, ask her out.
Perhaps you could arrange a foursome with your friend and his girl. You could go to the pictures, or for a picnic, or to watch a sporting fixture ~ something 'casual' like that.
Pluck up your courage and ask her ~ after all she dared to kiss you!
Good luck & welcome.