FWIW, I agree pretty much w everyone else. I would e-mail W but WAIT a while. Not jumping to get the phone is O.K. but don't do it out of anger, because she'll be able to sense it when you talk to her. I would wait a day or two to e-mail.
When you do e-mail W, I wouldn't go point for point either. Just skim over the important points, express thanks for her concern about your well-being...you have been doing well but very busy. Be busy for real, so when she asks what you are busy w you can say "oh, I went to lunch w a friend" or whatever.
I would either ignore the vacation subject or do what l_e says if a time share is the case.
