Apparently she's coming over to the house and treating it like any other halloween. She invited her best friend/husband, asked about getting food, etc.
Wait a minute. Weren't you having something at your house for the kids...and she asked if she was invited? Now she has taken it upon herself to invite another couple and act like the Mrs. of the house?
Maybe I have you confused with someone else's plans. But still, that seems very presumptuous of a woman who doesn't want to stay in the M.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!