She was being begged by the President and Max Mayfield starting on the Sat. before, and I don't think she gave her blessing to the help until Wednesday, if memory serves. I'm sure Miss Marple knows.
I believe you are correct. Chairman_December_19th_Society did an excellent time line on this. I believe he is gone today, so if he doesn't give you a link, I will try to find it later on this afternoon.
This is the timeline the Chair of the ATRW thread did:
http://freerepublic.com/focus/chat/1485619/posts?page=7