I imagine that if you had made a move right when you got IOI's the first time, you would have had better results. Keep in mind that you remember her, but she's seen hundreds of customers after you left, so even if she was interested at first, she now doesn't remember you. Now, let's assume the opposite for a second. If she does remember you, she might remember that you weren't responsive to her initial advances... So in this case, it's lose-lose.
Learn from it and move on. Try having one opener ready to go at any time so you can deliver it without effort when you detect an IOI, that way this won't happen again.
Good luck!