I don't think it's necessary for you to apologize to her...you didn't do anything wrong! Why don't you write her a little note telling her what you like about her. Keep it short. Maybe ask to meet her somewhere, on a specific date, and then give her YOUR phone number so that way, if she calls, you know she's interested in getting to know you better. If she doesn't call, you know that she isn't ready to meet someone new.

Good luck.