In my head, Whitney approached Pat like this: Mom, please, please come to this lame ass pillow party we (the producers) are making Craig have because the viewers seem to like you and we need all the help we can get to try and save this sinking ship because these people have become boring AF. You don't have to stay long, I promise. Michael can wait outside in the car for you.
Pat being there was ridiculous. So was Madison visiting Pat. Madison is Pat's hairdresser, not her buddy. They need to keep Pat in her lane of hosting once a year dinner parties at her fantabulous house.