Tad, To answer your question about hiding or flaunting the OP...it all depends upon the mlcer and how he acts out during his/her crisis. There is no one "fit all" when it comes to mlcers.
Does she really know what day she wants her son to come over? LOL! I think she's trying to get a rise out of you w/the change in dates. You did well in responding to her.
Enjoy the rest of your holiday!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.