SA, I think you're taking the right DB approach in this case. W told you she had other plans, so you made plans that didn't involve her. Then she happily informs you that you are plan B if her primary plans fall through? That's crap. I think you were fine in telling her there's no room. It would be different if you had invited her along, but since SHE made plans then she shouldn't expect you to be obligated to fit her into your plans "just in case".
