oh dear....there is really a lot of talent for making things difficult. Why not put your energy in to doing something that makes sense?
It really is quite simple. Buy a nice bouquet of flowers for her, have them delivered to her.. Put a card with it that says that you like her, or what ever you feel you can't express when standing in front of her.
A few days later you go and ask her if she liked the flowers and if she would like to have coffee with you. Voila, done.