This, then change all your info and pics to private so only friends see your stuff. Then stop using FB lolJust don't add them to facebook. I almost never do. I use facebook purely for people and family I can't go directly hang out with.
You asked her if she wanted to grab coffee. Then you asked if the time worked. Then you asked if the place was okay. Then you asked if she'd prefer tea.
Four questions. Four chances for her to say no. Four signals that you're terrified of making a decision.
Plan it. Pick the place. Pick the time. Tell her where to meet you. She'll either show up or she won't.
Either way, you look like a man instead of a scared little boy.